WO2014173337A1

WO2014173337A1 - Method and terminal for determining frequency hopping pattern of sounding reference signal

Info

Publication number: WO2014173337A1
Application number: PCT/CN2014/077342
Authority: WO
Inventors: 谢一宁; 梁春丽
Original assignee: 中兴通讯股份有限公司
Priority date: 2013-07-01
Filing date: 2014-05-13
Publication date: 2014-10-30
Also published as: CN104283582A; CN104283582B

Abstract

A method and terminal for determining the frequency hopping pattern of a sounding reference signal, the method comprising: the terminal constructing a first master table and a second master table, wherein the first master table comprises a plurality of first sub-tables and the second master table comprises a plurality of second sub-tables; the terminal obtaining a corresponding sequence through table lookup according to whether a base station enables the frequency hopping of the sounding reference signal (SRS), and obtaining identifications of the 0th to Bth SRS layers of a tree structure through the sequence, and determining the frequency domain location of the current sounding reference signal on the basis of the identifications, so as to determine the frequency hopping pattern of the sounding reference signal. Through the embodiment of the present invention, parameters can be sent according to relevant SRS configured by the base station, and the frequency hopping pattern of the SRS can be rapidly and conveniently determined.

Description

Method and terminal for determining frequency hopping pattern of sounding reference signal

Technical field

The present invention relates to the field of wireless communications, and in particular, to a terminal (UE) in a 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) system, and a method and terminal for determining a sounding reference signal (SRS) hopping pattern for uplink transmission . Background technique

In the 3GPP LTE system, in order to assist the base station (eNodeB) to perform uplink channel measurement, the terminal in the cell in which the base station is configured transmits a Sounding Reference Signal (SRS) on some specific time-frequency resources. Based on the received SRS measurement result, the base station may transmit, perform frequency-domain scheduling on the physical uplink shared channel (PUSCH) of the terminal, and determine a modulation and coding mode used for uplink traffic channel transmission. Improve the spectrum utilization of the uplink.

In the LTE system, the channel bandwidth is divided into several resource blocks (RBs), and all uplink signals or channels are allocated in units of resource blocks. In the frequency domain, the width of one RB is 12 subcarriers, that is, 180 kHz. The total number of resource blocks in the channel bandwidth is determined by the channel bandwidth. For example, the LTE system 20MHz bandwidth option contains a total of 100 RBs, and the 10MHz bandwidth option contains a total of 50 RBs.

In order to perform uplink channel sounding, when the base station allocates SRS resources for the terminal, it is necessary to ensure that the SRS transmission signals of the terminals are orthogonal to each other. For example, the base station performs intra-cell availability by allocating different time resources (subframes), and/or different frequency resources (RBs), and/or different code resources (cyclic shift) to each terminal in the cell. The SRS resources are divided to ensure that the SRSs sent by the terminals do not interfere with each other. Moreover, in order to ensure the single-carrier (SC-FDMA) feature of the uplink signal, the base station always configures each terminal to perform SRS transmission on consecutive RBs, that is, the SRS transmission bandwidth is always Contains several consecutive RBs.

In response to the above system requirements, different SRS bandwidth configuration parameters (Table 5.5.3.2-1 to Table 5.5.3.2-4) are defined for different channel bandwidths in section 5.5.3.2 of the 3GPP LTE specification TS 36.211. For example, take the 20MHz bandwidth (100 RBs in the uplink) as an example, see the following table: SRS-bandwidth SRS-bandwidth SRS-bandwidth SRS-bandwidth

SRS bandwidth configuration 1

( c ) ^w SRS N ₀ ^W SRS, 1 N\ ^W SRS, 2 w ₂ ^W SRS, 3 w ₃

0 96 1 48 2 24 2 4 6

1 96 1 32 3 16 2 4 4

2 80 1 40 2 20 2 4 5

3 72 1 24 3 12 2 4 3

4 64 1 32 2 16 2 4 4

5 60 1 20 3 4 5 4 1

6 48 1 24 2 12 2 4 3

7 48 1 16 3 8 2 4 2

In the above table, the parameter "SRS Bandwidth Configuration" represents the total frequency domain resource allocated by the base station for SRS transmission of all terminals in the cell, and therefore is a cell-specific parameter; another parameter" SRS-Bandwidth represents the bandwidth occupied by the actual SRS transmission allocated to a specific terminal (UE-specific) according to the needs of the system. For convenience of presentation, the SRS bandwidth configuration is represented by the variable C _SRS , and the SRS-bandwidth is represented by the variable S _SRS . In order to provide a flexible configuration, the base station can separately configure c _SR according to actual needs. e _SRS parameters. For example, the above table allows eight SRS bandwidth configurations, with a minimum of 48 RBs and a maximum of 96 RBs. For a specific terminal, four different SRS-bandwidth configurations are allowed, and a minimum of four RBs is available. Compensates for the entire SRS bandwidth configuration. Since the minimum bandwidth of the SRS in the LTE system is 4 RBs and is allowed to be transmitted in the range of up to 96 RB frequency domains, there are 96/4=24 possible frequency domain transmission start positions. Correspondingly, the base station assigns each terminal a SRS frequency domain location index parameter «RRc, which is an integer ranging from [0, 23]. According to this parameter, the terminal can determine the frequency domain location of the SRS. .

From the perspective of frequency domain resource allocation, on the one hand, in order to obtain better frequency domain scheduling gain, it is expected that the terminal performs SRS transmission in a wide frequency range, that is, the SRS transmission bandwidth needs to be set large, so that the base station can be accessed. Uplink channel measurement results in the entire channel bandwidth; on the other hand, considering that there may be a large number of terminals in the cell that need to transmit SRS, and the total resources allocated to the SRS transmission are limited, it is desirable to limit the transmission of each terminal. SRS bandwidth. To address this contradiction, an SRS "Frequency Hopping" mode is defined in the LTE specification. In this frequency hopping mode, although the SRS bandwidth sent by the terminal is small each time, it can be transmitted in different frequency domain positions at different times. After a SRS hopping period, it can completely cover a wider bandwidth. Bandwidth. Taking the frequency hopping pattern shown in Figure 1 as an example, refer to the above table, assuming the parameter C _SRS = 6,

And RR _C =0, the black box in the figure represents the corresponding frequency domain location sent SRS, and the white box represents unsent. It is assumed that the SRS frequency hopping is enabled in the base station. The actual transmission bandwidth of the SRS is 4 RBs per time. After 48/4=12 times of SRS transmission in different frequency domain positions in one SRS hopping period, the entire 48 RBs can be covered. The spectrum portion then continues to repeat the hopping pattern during the next SRS hopping period. In an SRS hopping period, the SRS sends the selected starting RB offset sequence, called the SRS "Frequency Hopping Pattern". In this example, the SRS hopping pattern is {0, 6, 3, 9, 1 , 7, 4, 10, 3, 8, 5, 1 1 }. Different terminals in the small area, although they may have the same frequency hopping mode, can use the SRS frequency domain location index "RRC as the "reference", and can still avoid conflicts between the frequency domain locations of SRS transmission between them, and do not interfere with each other.

A "tree" type structure is used in the 3GPP specification to assist in the definition of SRS hopping patterns. This "tree" contains up to 4 layers, which are in turn labeled with b=0, l, 2, 3, where b=0 corresponds to the highest level of the "tree", the root node. In layer b, each node on the "tree" has the number of RBs included in the frequency equal to w _SRS and ^ indicates the number of branch nodes in the b-th layer contained in the b-1th node. In the "tree" type structure, each node in the bth layer can uniquely determine 0 < n _b < N _b by a group of identifiers «1, ..., «3⁄4} of the 0th to the bth layers. Each node in the "tree" represents the bandwidth and starting offset of the SRS transmission in the frequency domain. See Figure 2 for an example of a tree structure in which a digital identifier is displayed in each node.

If the base station enables SRS frequency hopping, the terminal configures the S _SRS according to the SRS bandwidth configured by the base station, and determines the layer in the "tree" based on b=S _SRS , and obtains the actual bandwidth of each SRS sent by the SRS. _3⁄4s . On the other hand, the terminal is based on a "SRS hopping bandwidth" parameter bh configured by the base station. _P , can be based on 6= . p to determine the other layer in the "tree", the total bandwidth covered by the SRS frequency hopping is equal to this, based on the "tree" type structure, the SRS hopping pattern can be conveniently defined: according to the SRS transmission timing count _SRS , to determine the offset and bandwidth in which the corresponding SRS is transmitted in the frequency domain, that is, to determine a set of identifiers n..., η. In Section 5.5.3.2 of the 3GPP LTE specification TS 36.21 1 , the following formula is defined ( b = 0, l , . . . , B _SRS ):

The physical meaning of the above formula, may be understood in two ways, on the one hand the frequency-domain location index WRRC SRS transmission may be determined according to the reference position of the base station configuration ^{SRS: {^ = L 4 "/«½wJm.dN} ¾ | b = 0, l, ... ,

^SRS} ; on the other hand, on the basis of the bh p + l layer to the S _S RS layer, plus one

The frequency domain offset of the SRS hopping pattern is 3⁄4 « _SRS ), and finally the actual frequency domain transmission position of the SRS is obtained. Note that this formula unifies the two scenarios of SRS frequency hopping disable and enable. For the case of disabling SRS frequency hopping, the base station only needs to configure bh ≥ BSRS. At this time, it will not enter the following branch in the above formula to calculate. The frequency hopping pattern has a frequency domain offset of 3⁄4 « _SRS ). In the example of Figure 1, the correlation between the value of {« ₀ , , ... , n _b } and the actual frequency hopping position is given. The frequency hopping pattern period is equal to "1⁄2". _ρ /»1⁄2^^.

The principle of determining the SRS hopping pattern includes two points: (1) not repeating in one hopping period, and completely covering the SRS bandwidth configuration for the target; (2) between two consecutive SRS transmission frequency domain positions, the frequency interval should be As large as possible. In order to meet the above requirements, a calculation formula for the frequency domain offset (« _SRS ) of the SRS hopping pattern is also given in section 5.5.3.2 of the 3GPP LTE specification TS 36.211:

According to the above formula, the UE can calculate the frequency domain offset of the SRS hopping pattern, so that the frequency domain position of the SRS hopping transmission can be further determined.

It can be seen from the above equation that although the formula can give the SRS hopping pattern frequency domain offset calculation formula unambiguously, the form is relatively simple, but the calculation involves such things as multiplication (n N _3⁄4 , ) and modulo (mod). The calculation of the terminal is relatively high, such as rounding down (L*) and multiplying/dividing. Further, the calculation of the reference positions associated with the SRS transmission, i.e. the value determined according to L ⁴ "m.dN _¾ formula, also relates to the division, rounded down, computing modulo the like.

The terminal uses the above formula to calculate the SRS hopping pattern on-line, which will bring about no small complexity: If the processor soft mode is used for calculation, the terminal processor will require a higher operating frequency, resulting in The power consumption increases; if the hardware circuit is used for calculation, the overhead of the hardware circuit will increase, resulting in an increase in terminal cost.

Summary of the invention

The technical problem to be solved by the present invention is to provide a method for determining a frequency hopping pattern of a sounding reference signal And the terminal to quickly and conveniently determine the SRS hopping pattern.

In order to solve the above technical problem, the present invention provides a method for determining a hopping pattern of a sounding reference signal, including:

The terminal constructs a first parent table and a second parent table, wherein the first parent table includes a plurality of first child tables, and the second mother table includes a plurality of second child tables;

The terminal selects a first sub-table from the first parent table according to the system uplink bandwidth NRB ^UL and the sounding reference signal bandwidth configuration parameter C _SRS delivered by the base station;

The terminal according to the sounding reference signal bandwidth parameter S _SRS and the sounding reference signal frequency domain position index parameter “RR _C ” sent by the base station, based on the selected first sub-table and “RR _C as an index, obtains the inclusion by looking up the table. S _SRS +1 sequence of elements z)}, where

Determining, by the terminal, whether the base station enables the sounding of the sounding reference signal, and if the base station determines that the sounding of the sounding reference signal is enabled by the base station, determining the sounding pattern of the sounding reference signal by the following steps: according to the NRB ^UL and the The C _SRS selects a second sub-table from the second parent table; and hops the bandwidth parameter b _h according to the sounding reference signal sent by the base station. _p , in each hopping reference signal hopping period, according to the sounding reference signal transmission timing count " _SRS , based on the selected second sub-table, with ", ^ = («^ 1110 (1 as an index, obtained by looking up the table) Contains S _SRS -b _h . Sequence of _p elements: {g(/)}, where = = _P +1, — , S _SRS , S is a step associated with _.p , P = m _SRSJ m , sounding reference signal tree structure represents the first b _h. _p layer corresponding to the bandwidth sounding reference signal tree structure represents the first ¾ _RS bandwidth corresponding layer, by the sequence (p (0}, and the sequence ί Ο} is added to the sequence to obtain the identifiers n _{b of} the 0th to S _Sth layers of the tree structure:

For 0 ≤ _b ≤ _b _hop , n _b = p (b),

For ^hop < b < B _SRS , n _b = (p(b) + q(b)) mod N _b ,

And determining, according to the determining a frequency domain position of the current sounding reference signal, by determining a frequency domain position of the sounding reference signal in a total of P times in a sounding period of the sounding reference signal, to obtain a sounding pattern of the sounding reference signal;

If the terminal determines that the base station does not enable the sounding reference signal to hop, the terminal determines the sounding reference signal hopping pattern by the following steps: Tree obtained by the sequence (p (0} 0 through S _SRS layer identifier n _b:

n _b = p(b) , b=(V.. , B _SRS

Based on the determining the frequency domain position of the current sounding reference signal, the sounding domain position of the sounding reference signal is determined a total of P times in a sounding period of the sounding reference signal to obtain a sounding pattern of the sounding reference signal.

Preferably, the foregoing method has the following features: the terminal determines whether the base station enables the sounding of the sounding reference signal, including:

The terminal reads the sounding reference signal hopping bandwidth parameter b _h in the dedicated configuration delivered by the base station. _p , then compare with the S _SRS , if bh. _P < BsRS , then determining that the base station enables the sounding reference signal to hop; if bh. If p≥BsRs, it is determined that the base station does not enable SRS frequency hopping.

Preferably, the above method also has the following features:

The first sub-list includes 24 rows, which in turn correspond to all possible values of the WRRC; the second sub-table includes m _SRS , ₀ / 4 rows, which in turn correspond to b _h . _{When P} =0, all sounding reference signal transmission timings of a sounding reference signal hopping period, where w _SRS ,. The bandwidth corresponding to the layer 0 of the SRS tree structure is a positive integer determined according to the NRB ^UL and the C _SRS , and the value is a multiple of 4 and a maximum of 96.

Preferably, the above method also has the following features:

Each of the first sub-table and the second sub-table includes four non-negative integers.

Preferably, the above method also has the following features:

The first parent table sequentially corresponds to all combinations of NRB ^UL and C _SRS ;

The second mother table sequentially corresponds to all combinations of NRB ^UL and C _SRS .

In order to solve the above problems, the present invention further provides a terminal, including:

Constructing a module, configured to: construct a first parent table and a second parent table, wherein the first parent table includes a plurality of first child tables, and the second mother table includes a plurality of second child tables;

The selecting module is configured to: select a first sub-table from the first parent table according to the system uplink bandwidth NRB ^UL and the sounding reference signal bandwidth configuration parameter C _SRS delivered by the base station;

The table lookup module is configured to: according to the sounding parameter bandwidth parameter S _SRS and detection sent by the base station Reference signal frequency domain location index parameter "RR _C , based on the selected first sub-table with "RR _C as an index, by looking up the table to obtain a sequence containing S _SRS +1 elements,

, β _{δ] δ} ;

The determining module is configured to: determine whether the base station is enabled with the sounding of the sounding reference signal; the first determining module is configured to: when the determining module determines that the base station enables the sounding of the sounding reference signal, the determining is determined by the following Sounding reference signal hopping pattern:

Selecting a second sub-table from the second mother table according to the NRB ^UL and the C _SRS ; and hopping the bandwidth parameter b _h according to the sounding reference signal sent by the base station. _p , in each hopping reference signal hopping period, according to the sounding reference signal transmission timing count " _SRS , based on the selected second sub-table, with ", ^ = («^ 1110 (1 as an index, obtained by looking up the table) Contains S _SRS -b _h . Sequence of _p elements: { , where corpse bhop+1, S is a step size associated with .p,

^P = ^m SRS, _bhop /m _S RS, B _SRS , represents the bandwidth corresponding to the p- _th layer in the tree structure of the sounding reference signal, ^, _3⁄4s represents the bandwidth corresponding to the e- _SRS layer in the tree structure of the sounding reference signal, The identifier n _{b of} the 0th to S _Sth layers of the tree structure is obtained by the sequence (0}, and the sequence and the sequence are added:

For 0 ≤ _b ≤ _b _hop , n _b = p(b) ,

For ^hop < b < B _SRS , n _b = (p(b) + q(b)) mod N _b ,

The second determining module is configured to: when the determining module determines that the base station does not enable the sounding reference signal frequency hopping, determine the sounding reference signal hopping pattern by:

Tree obtained by the sequence (p (0} 0 through S _SRS layer identifier n _b:

n _b = p(b) , b=(V.. , B _SRS

Preferably, the terminal further has the following features: The determining module is configured to: read the sounding reference signal hopping bandwidth parameter b _h in the dedicated configuration delivered by the base station. _p , then compare with the S _SRS , if bh. _P < BsRS , then determining that the base station enables the sounding reference signal to hop; if bh. _P ≥ 3⁄4 S , then it is judged that the base station does not enable SRS frequency hopping.

Preferably, the terminal further has the following features:

The first sub-table constructed by the building module includes 24 lines, which in turn correspond to all possible values of the RRC; the second sub-table includes w _SRS , _Q / 4 lines, which in turn correspond to b _h . _{When P} =0, the timing of all sounding reference signals in a hopping period of a sounding reference signal, where _SRS , is. The bandwidth corresponding to the layer 0 of the SRS tree structure is a positive integer determined according to the NRB ^UL and the C _SRS , and the value is a multiple of 4 and a maximum of 96.

Preferably, the terminal further has the following features:

Each of the first sub-table and the second sub-table constructed by the building block includes 4 non-negative integers.

Preferably, the terminal further has the following features:

The first parent table constructed by the building block sequentially corresponds to all combinations of NRB ^UL and C _SRS ; the second mother table sequentially corresponds to all

A combination of C _srs .

In summary, the embodiment of the present invention provides a method and a terminal for determining a hopping pattern of a sounding reference signal, which can determine a SRS frequency hopping pattern more quickly and conveniently according to the relevant SRS transmission parameters configured by the base station. BRIEF abstract

1 is a schematic diagram of an SRS frequency hopping pattern;

2 is a schematic diagram of a "tree" type structure for determining an SRS hopping pattern;

3 is a flowchart of a method for determining a hopping pattern of a sounding reference signal according to an embodiment of the present invention; FIG. 4 is a schematic structural diagram of a first mother table (including a plurality of first child tables) according to an embodiment of the present invention; A schematic diagram of the structure of the second parent table (including a plurality of second sub-tables) of the embodiment of the invention; FIG. 6 is based on different SRS frequency hopping parameters b _h . _p configuration, when using the second subtable to check the length of the asynchronous Schematic diagram

FIG. 7 is a schematic diagram of a terminal according to an embodiment of the present invention. Preferred embodiment of the invention

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

A preferred implementation of the technical solution will be described in detail below with reference to FIG. 3 to FIG. 6 :

Step 310: The terminal constructs a first parent table and a second parent table, wherein the first parent table includes a plurality of first child tables, and the second mother table includes a plurality of second child tables.

The terminal constructs the first parent table in advance based on the relevant definitions in section 5.5.3.2 of the 3GPP TS 36.21 1 specification. Using the first parent table, the terminal can look up the reference position of the SRS hopping pattern according to the SRS frequency domain location index WRRC configured by the base station.

Referring to FIG. 4, in the first parent table 400, according to the uplink bandwidth NRB ^UI % is included for 6 <

< 1 10 Table of the four NRB ¹ ^ range of values. For each of the ranges 410, a corresponding _CRSS (0 < C _SRS < 7) corresponding to all possible SRS bandwidths is included, and eight first sub-tables 420 are included. In each of the first sub-tables 420, values for each possible WRRC (0 < WRRC < 23) are included, and the corresponding values of 4, c, ί3⁄4, and ί3⁄4 are included. For example, according to specification 3GPP TS 36.21 1 in Section 5.5.3.2 of the relevant formula, according _{_{to: d b = L ¾ RC /}} w¾ SRS, Jmod N, (b = 0, 1, 2, 3) is calculated to obtain d _b value. Considering that the value of ί3⁄4 is a non-negative integer that does not exceed 6, it can be represented by up to 3 bits. In order to store each integer byte storage, it can be stored with no more than 2 bytes. d _x , ί3⁄4 and ί3⁄4. Thus, the construction of the first mother table 400 is completed. In the first parent table, there are a total of 4 * 8 = 32 such first sub-tables, wherein each first sub-table contains 24 items, and each item stores no more than 2 bytes. Therefore, the total size of the first parent table does not exceed 32 * 24 * 2 = 1536 bytes. The terminal may store the first parent table in ROM or FLASH. The size of the first subtable does not exceed 24 * 2 = 48 bytes. On the other hand, the terminal constructs the second mother table in advance based on the relevant definitions in section 5.5.3.2 of the 3GPP TS 36.21 1 specification. Using the second mother table, the terminal can obtain the frequency domain offset of the SRS hopping pattern according to the SRS transmission timing count _SRS .

Referring to FIG. 5, in the second mother table 500, according to the uplink bandwidth NRB ^UI % is included for 6 <

< 1 10 Table of the four NRB ¹ ^ range of values. For each of the ranges 510, C _SRS ( 0 < C _SRS < 7 ) is configured corresponding to all possible SRS bandwidths, and 8 second sub-tables 520 are included. Within each second sub-table 520, the possible values of the counts w _SRS for each SRS in the frequency hopping period are respectively included, and the corresponding values of d ₀ , 4, ί3⁄4 and ί3⁄4 are included. For example, according to the relevant formula in section 5.5.3.2 of the 3GPP TS 36.21 1 specification, you can press:

(b = 0, 1, 2, 3) to calculate the ^ value. Considering that the value of ί3⁄4 is a non-negative integer that does not exceed 6, it can be represented by up to 3 bits. In order to store each integer byte storage, it can be stored with no more than 2 bytes. d _x , ί3⁄4 and ί3⁄4. Thus, the construction of the second mother table 500 is completed. The depth of the second subtable can be expressed as: / _SRS . /4 is calculated, where _SRS and Q represent the bandwidth corresponding to layer 0 of the SRS tree structure, which is a positive integer determined according to N _R B ^UL and C _SRS , and the value is a multiple of 4 and the maximum does not exceed 96. For example, according to a specification 36.21 5.5.3.2 in the section definitions, corresponding to the range of four kinds NRB ^UL, w _SRS, o maximum values are not more than 36, 48, 72 and 96, thus the respective first The number of rows D of the two sub-tables does not exceed 9, 12, 18, and 24. In the second parent table, there are a total of 4 * 8 = 32 such second sub-tables, and each second sub-table contains D items, each of which stores no more than 2 bytes, so that the total size of the second parent table Do not exceed: (9 + 12 + 18 +24) * 8 * 2 = 1008 bytes. The terminal may store the first parent table in ROM or FLASH. The size of the second subtable does not exceed 24 * 2 = 48 bytes.

Step 320, the terminal receives the uplink bandwidth of the system.

After the SRS bandwidth configuration parameter C _SRS delivered by the base station, the first sub-table is selected from the first parent table according to the NRB ^UL and the C _SRS .

After the terminal accesses the network and reads the system message and the common configuration of the cell delivered by the base station, the terminal can obtain Upstream bandwidth NRB ^UL and SRS bandwidth configuration parameter C _srs . according to

C _srs , the terminal may select the corresponding first sub-table from the 32 first sub-tables included in the first parent table. The terminal can load the selected first sub-table from ROM or FLASH into the DBB chip for quick access. Since the size of the first sub-table does not exceed 48 bytes, the overhead after moving to the inside of the DBB chip is very high.

Step 330: According to the SRS-bandwidth parameter S _SRS and the SRS frequency domain location index parameter WRRC sent by the base station, based on the first sub-table, using WRRC as an index, obtain a sequence including S _SRS +1 elements by looking up the table: /? (0), /?(1), ... , p(B

After the terminal accesses the network, the SRS-bandwidth parameter S _SRS in the dedicated signaling sent by the base station is read, and the actual bandwidth occupied by each SRS transmission can be determined. Therefore, only the pre-S _SRS + needs to be determined in the "tree" type structure. The identification of the 1st layer can be, where b = 0, l, ..., S _SRS . Based on the first sub-list selected in step 320, according to the SRS frequency domain location index parameter “RR _C indicated by the base station in the dedicated signaling, the corresponding sub-table can be obtained after obtaining the corresponding 4, d _x . 3 3⁄4 And ί3⁄4 take the value, take the pre-S _SRS + 1 item, and get the sequence containing S _S RS+ 1 element: /?(0), /?(1), ..., p(B _SRS ):

p{i = d _b , = 0,1,...,S _SRS

Where each element;? (z) is a non-negative integer whose value ranges from 0≤/?(ζ)≤^, ι = 0,1,..., 3⁄4RS

Then, the terminal reads the SRS frequency hopping bandwidth parameter b _h in the dedicated configuration delivered by the base station. Then, after comparing with the parameter S _SRS , it is determined whether the base station enables SRS frequency hopping. If bh. If p<B _S RS, the base station enables SRS frequency hopping, and steps 340 to 360 are sequentially performed; if bh. _{If P} ≥ BsRs, the base station does not enable SRS frequency hopping, and the process proceeds to step 370.

Step 340: Select a second sub-table from the second parent table according to the system uplink bandwidth NRB ^UL and the SRS bandwidth configuration parameter C _SRS delivered by the base station.

After the terminal accesses the network and reads the system message and the common configuration of the cell, the uplink bandwidth NRB ^UL and the SRS bandwidth configuration parameter C _{srs are obtained} . according to

C _srs , the terminal may select a corresponding second sub-table from the 32 second sub-tables included in the second parent table. The terminal can load the selected second sub-table from ROM or FLASH into the DBB chip for quick access. Since the size of the second sub-table does not exceed 48 bytes, the overhead after moving to the inside of the DBB chip is small. Step 350: According to the SRS frequency hopping bandwidth parameter b _h delivered by the base station. _p , in each SRS hopping period, according to the SRS transmission timing " _SRS , based on the selected second sub-table, with W'SRS = ("SRS mod · S as an index, by looking up the table to get ^-^ Sequence of elements: bh. _P +l), (b _hop +2), ... , q(B _SRS ) ₀

According to the SRS transmission timing, " _SRS , and according to the parameter bh. _P , to determine the index of the second subtable: "'SRS = ("SRS mod P) · S.

Among them, the corpse is determined by the parameters b _hop and _SRS together, P 2 m _{SRS b} / _{SRS BsRs} , m _SRS , _b represents the b _h in the tree structure of the sounding reference signal. The bandwidth corresponding to the _p layer, ^1⁄25, _3⁄45, represents the bandwidth corresponding to the e- _SRS layer in the tree structure of the sounding reference signal, and the value does not exceed the number D of rows of the second sub-table. When b _h . _{When p} =0, Ρ=Γ» is the number of rows in the second subtable, and the step size is selected =^=1; when b _h . When p>0, the second subtable can be used to look up the table by using the "nesting" feature of the second subtable, but the modification step is s=n ^b _b N _b . Referring to the example of Fig. 6, B _SRS = 3 is assumed in this example. Then, based on the second sub-table selected in step 340, using _SRS as an index, the second sub-table is checked to obtain corresponding values of 4, di, 4, and ί3⁄4, where 笫b _{h is obtained} . _{From p} + l to the _SRS term, the sequence of ^^-^^ elements is obtained: (3⁄4op+l),

... , q(B _S Rs)

q(i) = d _b , i = bhop + 1, ^hop + 2, ... , S _S S

Where each element (z) is a non-negative integer whose value ranges from 0 ≤ g(z) ≤ N6, ι =

In this example, the corresponding parameter b _{h is used} . _p = 0, can be calculated to the frequency hopping period

^{P =} N ₆ = N. = 1;

Corresponding to the parameter b _h . _p = l, Computable to the frequency hopping period two /^^.^ = ²⁴ M = 6, step size ^ N^No 'N^ l · 2 = 2;

Corresponding to the parameter b _h . _p = 2, computable to the frequency hopping period P = w1⁄23⁄4 /"1⁄2 _3⁄4s = U/ ⁴ = 3, ψ long

1 · 2 · 2 = 4. Step 360, obtaining the identifiers of the 0th and 1st S _SRS layers of the tree structure by using the sequence p(/:)}, and the sequence and the sequence phase port respectively.

For 0 ≤ _b ≤ _b _hop , n _b = p{b) For ^hop <b< B _SRS , n _b = (p{b) + q{b)) mod N _b ;

Then go to step 380.

Step 370, if bh. If p ≥ B _S Rs, the base station does not enable SRS frequency hopping, and the process proceeds to step 370. The sequence obtained in step 330 obtains the identifiers of the 0th and 1st S _SRS layers of the tree structure respectively, n _b =p(b), then go to step 380.

Step 380, based on the identifier n _Q , «!, n _BsRs , can determine the frequency domain location of the current SRS transmission.

The frequency domain start position of each SRS transmission, that is, R, can be calculated based on the "tree" structure according to the following formula

Where w _SRS , 6 is a positive integer determined according to NRB ^UL , C _SRS and S _SRS , and its value is a multiple of 4 and the maximum does not exceed 96.

Thus, for the case of enabling SRS frequency hopping, the SRS hopping pattern can be obtained by a total of P times in the above-mentioned steps 310 to 360 and the processing steps of step 380 in one SRS hopping period. For the case where the SRS frequency hopping is not enabled, through the above steps 310 to 330, and steps 370 and 380, a fixed frequency domain position of the SRS transmission can be obtained. Wherein, step 310, that is, the table construction can be performed in advance, and step 320 can be performed after reading the common configuration of the base station, so steps 310 and 320 need not be repeated.

among them:

The first sub-table contains 24 lines, which in turn correspond to all possible values of the RRC index;

The second subtable contains D = m _SRS , ₀ / 4 lines, which in turn correspond to b _h . _{When S} = 0, all SRS transmission timings in one SRS hopping period; S = Π^ _3⁄4 . . / ^ is with b _h . A step associated with _p ; in the first sub-table and the second sub-table, each row contains 4 non-negative integers: d ₀ , d (1 ₂ and d ₃ where ί3⁄4 has a value range of 0 ≤ ί3⁄4 <^ (b=0, l, 2, 3), where N6 is a positive integer determined according to NRB ^UL , C _SRS and BSRS.

Terminal storing a first alphabet, the first master table corresponds to the sequence of all the possible and NRB ^UL (^! ^ Parameters The number combination contains multiple first subtables.

The terminal stores the second mother table, which in turn corresponds to all possible NRB ^UL and (^!^ parameter combinations, and includes a plurality of second child tables.

For the case of enabling SRS frequency hopping, the SRS hopping pattern can be obtained by a total of P such processing steps in one SRS hopping period.

FIG. 7 is a schematic diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 7, the terminal in this embodiment may include:

a constructing module, configured to construct a first parent table and a second mother table, wherein the first parent table includes a plurality of first child tables, the second mother table includes a plurality of second child tables; and the selecting module is configured to perform uplink according to the system The bandwidth NRB ^UL and the sounding reference signal bandwidth configuration parameter C _SRS sent by the base station, select a first sub-table from the first parent table; the look-up table module is configured to use the sounding reference signal bandwidth parameter ^SRS sent by the base station And the sounding position reference parameter "RR _{C of the} sounding reference signal", based on the selected first sub-table with "RR _C as an index, by looking up the table to obtain a sequence containing S _SRS +1 elements { (ζ)}, where, =( ..,β _δ] «;

a determining module, configured to determine whether the base station is enabled with the sounding of the sounding reference signal; the first determining module is configured to: when the determining module determines that the base station enables the sounding of the sounding reference signal, determine the sounding reference by the following Signal hopping pattern:

Selecting a second sub-table from the second mother table according to the NRB ^UL and the C _SRS ; and hopping the bandwidth parameter b _h according to the sounding reference signal sent by the base station. _p , in each hopping reference signal hopping period, according to the sounding reference signal transmission timing count " _SRS , based on the selected second sub-table, with ", ^ = («^ 1110 (1 as an index, obtained by looking up the table) Contains S _SRS -b _h . Sequence of _p elements: { (/)} , where , = _P + l, — , esR _S , S is a step size associated with .

^P = ^m SRS _op

, indicating the bandwidth corresponding to the p- _th layer in the tree structure of the sounding reference signal, ^, _3⁄4s represents the bandwidth corresponding to the S _SRS layer in the sounding reference signal tree structure, through the sequence (0}, and the sequence ί Ο} is added to the sequence to obtain the identifiers n _{b of} the 0th to S _Sth layers of the tree structure:

For 0 ≤ _b ≤ _b _hop , n _b = p(b) , For ^hop < b < B _SRS , n _b = (p{b) + q{b)) mod N _b ,

a second determining module, configured to: when the determining module determines that the base station does not enable the sounding reference signal hopping, determine the sounding reference signal hopping pattern by:

Tree obtained by the sequence (p (0} 0 through S _SRS layer identifier n _b:

n _b = p(b) , b=(V.. , B _SRS

The determining module is specifically configured to read the sounding reference signal hopping bandwidth parameter b _h in the dedicated configuration delivered by the base station. _p , then compare with the S _SRS if b _h . _p < S _SRS , then determining that the base station enables the sounding reference signal to hop; if bh. _P ≥ 3⁄4 s, then it is judged that the base station does not enable SRS frequency hopping.

The first sub-table constructed by the building module includes 24 lines, which in turn correspond to all possible values of the RRC; the second sub-table includes w _SRS , _Q / 4 lines, which in turn correspond to b _h . _{When P} =0, the timing of all sounding reference signals in a hopping period of a sounding reference signal, where _SRS , is. The bandwidth corresponding to the 0th layer of the SRS tree structure is a positive integer determined according to the NRB ^UL and the C _SR J|, which is a multiple of 4 and a maximum of 96.

The method and the terminal provided by the embodiment of the present invention can reduce the computational complexity of determining the SRS frequency hopping pattern process by the terminal, and save the terminal power or Reduce terminal costs.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct the associated hardware, such as a read only memory, a magnetic disk, or an optical disk. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the foregoing embodiment may be implemented in the form of hardware, or may be implemented in the form of a software function module. The invention is not limited to any What is the combination of specific forms of hardware and software.

The above is only a preferred embodiment of the present invention, and of course, the present invention may be embodied in various other embodiments without departing from the spirit and scope of the invention. Corresponding changes and modifications are intended to be included within the scope of the appended claims.

Industrial applicability

The embodiment of the invention provides a method and a terminal for determining a hopping pattern of a sounding reference signal, which can determine the SRS frequency hopping pattern more quickly and conveniently according to the relevant SRS transmission parameters configured by the base station.

Claims

Claim

A method for determining a frequency hopping pattern of a sounding reference signal, comprising:

The terminal according to the sounding reference signal bandwidth parameter S _SRS and the sounding reference signal frequency domain position index parameter “RR _C ” sent by the base station, based on the selected first sub-table and “RR _C as an index, obtains the inclusion by looking up the table. S _SRS +1 sequence of elements,

Determining, by the terminal, whether the base station enables the sounding of the sounding reference signal, and if the base station determines that the sounding of the sounding reference signal is enabled by the base station, determining the sounding pattern of the sounding reference signal by the following steps: according to the NRB ^UL and the The C _SRS selects a second sub-table from the second parent table; and hops the bandwidth parameter b _h according to the sounding reference signal sent by the base station. _p , in each hopping reference signal hopping period, according to the sounding reference signal transmission timing count " _SRS , based on the selected second sub-table, with ", ^ = («^ 1110 (1 as an index, obtained by looking up the table) Contains S _SRS -b _h . Sequence of _p elements: {g(/)}, where = = _P +1 , — , S _SRS , S is a step associated with .p, P = m Jm _SRS , _BsRs , representing the b _{h of the} sounding reference signal tree structure, the bandwidth corresponding to the _p layer, representing the bandwidth corresponding to the 3rd _RS layer in the sounding reference signal tree structure, through the sequence ( 0 }, and the sequence Adding to the sequence to obtain the identifiers n _{b of} the 0th to S _SRS layers of the tree structure, respectively:

For 0 ≤ _b ≤ _b _hop , n _b = p(b) ,

For ^hop < b < B _SRS , n _b = (p(b) + q(b)) mod N _b ,

n _b = p(b) , b=(V.. , B _SRS

The method of claim 1, wherein the terminal determines whether the base station enables the hopping of the reference signal, including:

3. The method of claim 1 or 2, wherein

4. The method of claim 1 or 2, wherein

5. The method of claim 1 or 2, wherein

6. A terminal, comprising:

, β _{δ] δ} ;

For 0 ≤ _b ≤ _b _hop , n _b = p(b) ,

For ^hop < b < B _SRS , n _b = (p(b) + q(b)) mod N _b ,

Tree obtained by the sequence (p (0} 0 through S _SRS layer identifier n _b:

n _b = p(b) , b=(V.. , B _SRS

7. The terminal of claim 6, wherein The determining module is configured to: read the sounding reference signal hopping bandwidth parameter b _h in the dedicated configuration delivered by the base station. _p , then compare with the S _SRS , if bh. _P < BsRS , then determining that the base station enables the sounding reference signal to hop; if bh. _P ≥ 3⁄4 S , then it is judged that the base station does not enable SRS frequency hopping.

8. The terminal according to claim 6 or 7, wherein

9. The terminal according to claim 6 or 7, wherein

10. The terminal according to claim 6 or 7, wherein

A combination of C _srs .