CN101384055A - Device and method for configuring uplink reference signal for channel measurement - Google Patents

Abstract

A method for processing SRS by a base station, comprising the following steps: the system configures SRS parameters of a cell, including configuring different cyclic shifts of a basic sequence for each transmission comb; the base station sends SRS configuration information to user equipment, including allocating user equipment The indication bit of the comb and the bit indicating the cyclic shift are transmitted; the base station detects the SRS of the user equipment.

Description

Device and method for configuring uplink reference signal for channel measurement

technical field

The present invention relates to a wireless communication system, and more specifically relates to a device and method for configuring an uplink reference signal for channel measurement in the wireless communication system.

Background technique

Now, the 3GPP standardization organization has begun to carry out the long-term evolution (LTE) of its existing system specifications. Among the many physical layer transmission technologies, the downlink transmission technology based on Orthogonal Frequency Division Multiplexing (OFDM) and the uplink transmission technology based on Single Carrier Frequency Division Multiple Access (SCFDMA) are research hotspots. There are two frame structures in LTE: Type 1 Frame Structure and Type 2 Frame Structure. There are two duplex modes of FDD and TDD in the type 1 frame structure, but there is only one duplex mode of TDD in the type 2 frame structure.

According to the current discussion results of LTE, Figure 1 is the uplink frame structure of LTE type 1FDD, and the time length of its wireless frames (101~103) is the same as WCDMA, which is 10ms; each frame is subdivided into multiple time slots (104~107) , the current assumption is that each radio frame contains 20 time slots, and the time length of the time slot is 0.5ms; each time slot contains multiple SCFDMA symbols. The CP of the SCFDMA symbol has two lengths, namely the normal CP (normal CP) and the extended CP (extended CP). The time length of the general CP is about 4.7 μs, and the time length of the extended CP is about 16.7 μs. A general CP time slot includes 7 SCFDMA symbols, and an extended CP time slot includes 6 SCFDMA symbols. According to the current discussion results, two consecutive time slots constitute a subframe, and the transmission time interval (TTI) is 1 ms, which is equal to the time length of a subframe. The uplink subframe structure of LTE type 1 TDD is the same as the uplink subframe structure of LTE type 1 FDD.

According to the discussion result of current LTE, Fig. 2 is the frame structure of LTE type 2TDD, and the time length of radio frame (201～203) is 10ms; Each frame is equally divided into two 5ms half-frames (half-frame) (204, 205); each half-frame contains 7 time slots (206-212) and three special domains, i.e. downlink pilot time slot (DwPTS) (213), guard interval (GP) (214) and uplink pilot time slot Gap (UpPTS) (215). And the first time slot (206) and DwPTS of each half frame are fixedly used for downlink transmission, and the UpPTS and the second time slot (207) of each half frame are fixedly used for uplink transmission. Same as LTE type 1, each uplink time slot contains multiple SCFDMA symbols. The CP of the SCFDMA symbol has two lengths, namely the general CP and the extended CP. The general CP time slot contains 9 SCFDMA symbols, and the extended CP time slot contains 8 SCFDMA symbols. According to the current discussion results, each time slot is a subframe.

Fig. 3 is the signal processing process of SCFDMA, and the transmitting end obtains the modulation symbol (301) that it needs to send through certain processing, transforms to frequency domain through DFT module (301), then maps to system allocation through subcarrier mapping module (303) The position of the subcarrier is then transformed back to the time domain by the IFFT module (304), then the CP is added (305), and then subsequent operations are performed. Note that the DFT operation of the module (301 ) is called Pre-DFT operation in order to distinguish it from the IFFT operation (304) and the DFT operation performed at the time of reception.

In the current discussion of LTE, a class of sequences with many good properties is proposed, which are collectively referred to as CAZAC (Constant Amplitude Zero Autocorrelation) sequences. This type of sequence has a constant envelope in both the time domain and the frequency domain, and its cyclic autocorrelation function is 0, and its circular cross-correlation function is a small constant value. A set of sequences is obtained by performing different cyclic shifts on the same CAZAC sequence. This set of sequences has good cross-correlation properties, so that different user equipments are assigned to use different sequences in this set of sequences. The number of cyclic shift values available here is limited by the length of the sequence and the maximum multipath delay of the wireless channel.

Sequences with CAZAC properties are widely used in LTE systems, especially in the uplink direction, such as uplink reference signals (DM-RS) for data demodulation and uplink reference signals for channel measurement (abbreviated as CS-RS or SRS) etc. According to the current discussion results of LTE, the system bandwidth is divided into multiple resource blocks (RBs), where each RB includes 12 subcarriers in the frequency domain. In order to ensure the number of CAZAC sequences that can be generated, the length of the CAZAC sequence generated by the formula is generally a prime number, and the length of the sequence required in LTE uplink transmission is an even number, that is, a multiple of 12, so it is necessary to perform the CAZAC sequence generated by the formula Cyclic extension or truncation. Because the number of CAZAC sequences with a length of N (N is a prime number) is N-1, and the Cubic Metric (Cubic Metric) performance of these CAZAC sequences after expansion or truncation is not good, resulting in a short sequence length , the number of available CAZAC sequences is relatively small. Therefore, according to the current LTE discussion results, CAZAC sequences whose length is 3 times the number of RB subcarriers (ie 36) or longer are generated by the formula and the method of cyclic extension, and the length is equivalent to the number of subcarriers of one RB ( That is, 12) and sequences with the number of subcarriers (ie, 24) whose length is equivalent to two RBs are obtained through computer search, and these searched sequences should have properties similar to ideal CAZAC sequences.

In order to support the scheduling of uplink channel resources, especially the uplink frequency selective scheduling, the user equipment needs to send SRS in the uplink direction, and the base station estimates the uplink channel conditions of each user equipment according to the SRS, so as to complete resource scheduling. According to the current LTE discussion on SRS, there are various SRS bandwidths, and the base station can configure the bandwidth of the SRS sent by the user equipment. Figure 4 is a schematic diagram of the SRS multiplexing structure in the LTE system. The repetition factor (RPF) of the SRS transmission in one SCFDMA symbol is equal to 2, and the resources in such a SCFDMA symbol are divided into two according to frequency division multiple access (FDMA). transmission combs and are referred to as comb 0 (401) and comb 1 (402), respectively. In each transmission comb, the system bandwidth is divided into a plurality of local sub-bands for transmitting SRS signals, such as the SRS bandwidth (403 and 404) on comb 0 in FIG. 4 . In each partial sub-band, the system can configure multiple user equipments to transmit SRS in CDMA mode. The way to implement CDMA is to obtain multiple sequences based on the same sequence with CAZAC properties and multiple cyclic shift values. The base station can be configured to multiplex SRS signals of two different bandwidths in different transmission combs. For example, in FIG. of. To sum up, when configuring user equipment for SRS transmission, the base station needs to set the SRS transmission period, the subframes and SCFDMA symbols occupied by SRS, the transmission combs occupied by SRS, the bandwidth and frequency start position of SRS, and the basic parameters used by SRS. CAZAC sequence and value of cyclic shift, etc. According to the discussion results of LTE, the index of the SRS sequence is obtained through the sequence index of the physical uplink control channel (PUCCH) of the cell. This patent solves the problem of optimally configuring the SRS sequence and its cyclic shift value.

Contents of the invention

The purpose of the present invention is to provide a device and method for configuring uplink reference signals used for channel measurement in a wireless communication system.

According to one aspect of the present invention, a method for processing an SRS by a base station includes the following steps:

a) The system configures the SRS parameters of the cell, including configuring different cyclic shifts of the basic sequence for each transmission comb;

b) The base station sends the SRS configuration information to the user equipment, including the indication bit of the transmission comb allocated to the user equipment and the bit indicating the cyclic shift;

c) The base station detects the SRS of the user equipment.

According to another aspect of the present invention, a method for user equipment to process SRS includes the following steps:

a) The user equipment obtains a set of cyclic shifts of the basic sequence used by each transmission comb;

b) The user equipment receives the configuration information of the base station for its SRS;

c) The user equipment sends an SRS.

According to another aspect of the present invention, a device for processing SRS by a base station includes:

a) a cyclic shift information controller module, configured to generate configuration information of available cyclic shifts on each transmission comb;

b) SRS configuration information controller module, used to generate SRS configuration information for a user equipment

c) an SRS detector module, used to measure the uplink channel state of the user equipment.

According to another aspect of the present invention, a device for user equipment to process SRS includes:

a) a cyclic shift information parser module, configured to obtain a set of available cyclic shifts on each transmission comb;

b) SRS configuration information parser module, used to obtain the configuration information of the base station to its SRS

c) an SRS generator module, configured to generate an SRS according to the configuration information of the base station.

According to another aspect of the present invention, a method for configuring an SRS includes the following steps:

a) system configuration of SRS parameters, including the use of different base sequences for each transmission comb configuration;

b) The base station sends SRS configuration information to the user equipment;

c) The user equipment receives the configuration information of the SRS from the base station, and sends the SRS.

Description of drawings

Fig. 1 is the uplink frame structure of LTE type 1FDD;

Fig. 2 is the frame structure of LTE type 2;

Fig. 3 is the processing procedure of SCFDMA signal;

Fig. 4 is the multiplexing structure of SRS;

FIG. 5 is a device diagram of a base station processing SRS;

Fig. 6 is a device diagram of user equipment processing SRS.

Detailed ways

The present invention focuses on the method for the base station to configure multiple user equipments to send SRS in uplink symbols when RPF is greater than or equal to 1, and the value of RPF is N _RPF . The present invention does not limit the transmission technology used in the uplink direction of the system, that is, the uplink symbols may be SCFDMA symbols or OFDM symbols. In particular, according to the discussion results of the current LTE system, the uplink symbols are SCFDMA symbols, and the value of RPF is fixed at 2. In this way, the system uses FDMA to multiplex the SRSs of multiple user equipments on the N _RPF transmission combs of the uplink symbol. Here, the bandwidths of the SRSs on different transmission combs may be the same or different. In a transmission comb, the system bandwidth can be divided into multiple partial sub-bands, and the bandwidths of these partial sub-bands can be equal or unequal; in each partial sub-band, the system can configure multiple users The device transmits SRS in CDMA mode. In the LTE system, the way to implement CDMA is to obtain multiple sequences based on the same basic sequence with CAZAC properties and multiple cyclic shift values. Here, the basic sequence with CAZAC properties can be generated based on a formula, or can be obtained through computer search.

In order to reduce the interference between the SRS signals of the user equipment as much as possible, the present invention proposes two solutions, which will be described respectively below.

Solution 1: Configure different cyclic shifts on different transmission combs

则基站在为一个用户设备配置SRS时需要的指示循环移位值的比特数目为 $\mathrm{ceil}\left({\log }_2\left(N_{\mathrm{shift}}^{\mathrm{comb}}\right)\right).$ Because the SRS sequence is a sequence obtained by cyclically shifting the basic sequence, in order to reduce interference, the system configures different cyclic shift values on different transmission combs when configuring SRS. There is no limit to the configuration on different transmission combs. are the same or different base sequences. Note that the number of available cyclic shifts configured by the system on each transmission comb is

Then the number of bits indicating the cyclic shift value required by the base station when configuring the SRS for a user equipment is $\mathrm{the\; ceil}\left({\log }_2\left(N_{\mathrm{shift}}^{\mathrm{comb}}\right)\right).$

In the LTE system, the SRS may have different bandwidths, and correspondingly, the basic sequence may have different lengths. Obviously, the number of possible cyclic shifts of the basic sequences of different lengths is different. Generally, if the length of a basic sequence of a certain bandwidth is L, then the number of available cyclic shifts is also L. When the basic sequence is generated by cyclic extension, the length of the CAZAC sequence before cyclic extension is L _C , and the number of available cyclic shifts is L _C .

The number of cyclic shifts that can be multiplexed simultaneously on a transmission comb depends on the time spread of the channel and other interference factors. For example, for an SRS with a large bandwidth, the length of the basic sequence is very long, and the number of available cyclic shifts is large, but only a small part of the cyclic shifts are actually used in the system.

则第k个传输梳子上的各个可用循环移位满足公式

另一个可能的配置可用循环移位的公式是 $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k;$ 这里，k＝0，1，...N_RPF-1， $i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1,$

注意当L_B能够整除

时，上面的公式简化为 $s_i^k=i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}}+o_k.$ 这里，不同传输梳子配置的偏移参数o_k不同，并且o_k的设定应该保证不同传输梳子配置的可用循环移位的差异最大。o_k满足公式

或者满足公式 $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$ 这里

注意，对通过长度为L_C的CAZAC序列经循环扩展得到的长度为L的基本序列，系统仍然可以按照L_B＝L使用上面的公式计算可用循环移位，本发明对此不做限制。A method of determining available cyclic shifts on each transmission comb is described below, and the present invention does not limit the method of determining available cyclic shifts on each transmission comb. Note that the total number of available cyclic shifts of the basic sequence is L _B , and the number of available cyclic shifts on a transmission comb is

Then each available cyclic shift on the kth transmission comb satisfies the formula

Another possible formula for the available cyclic shifts of the configuration is ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k;$ Here, k=0, 1, . . . N _RPF -1, $i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1,$

Note that when L _B is divisible

, the above formula simplifies to ${\mathrm{the\; s}}_i^k=i\&Center\; Dot;\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}}+o_k.$ Here, the offset parameters _ok of different transmission comb configurations are different, and the setting of _ok should ensure that the difference of the available cyclic shifts of different transmission comb configurations is the largest. o _k satisfies the formula

or satisfy the formula $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$ here

Note that for a basic sequence of length L obtained by cyclically extending a CAZAC sequence of length _LC , the system can still use the above formula to calculate the available cyclic shift according to L _B =L, which is not limited by the present invention.

The base station may send configuration information on available cyclic shifts in a broadcast channel. In an LTE system, this information is generally sent in a dynamic broadcast channel (D-BCH).

The first method of sending available cyclic shift information is to send the value of each cyclic shift that can be used by the system for each transmission comb for each SRS bandwidth. This method requires less signaling overhead. big.

The second way to send information about the available cyclic shifts is that for each SRS bandwidth, the system sends the value of each cyclic shift for one transmission comb configuration, and sends the values of the cyclic shifts of other transmission combs relative to this transmission Comb cyclic shift increment, from which the actual available cyclic shift value can be calculated. For example, assuming that RPF is equal to 2, for a certain SRS bandwidth, the value of the cyclic shift configured by the system on a transmission comb is ${\mathrm{the\; s}}_i^0,i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1,$ and the increment is a, the value of the available cyclic shift on the other transmission comb ${\mathrm{the\; s}}_i^1={\mathrm{the\; s}}_i^0+a,i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1.$

$i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1.$ The third method of sending available cyclic shift information is to determine the ratio of the cyclic shift used according to the ratio of the SRS bandwidth; for a specific SRS bandwidth, the system sends the value of each cyclic shift configured by a transmission comb, And send the increment of the cyclic shift value of other transmission combs relative to the cyclic shift value of this transmission comb; thus, the actual available cyclic shift value of each SRS bandwidth can be calculated. For example, assuming that RPF is equal to 2, for the minimum SRS bandwidth, the value of the cyclic shift configured by the system on a transmission comb is ${\mathrm{the\; s}}_i^0,i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1,$ and the increment is a, the value of the available cyclic shift on the other transmission comb ${\mathrm{the\; s}}_i^1={\mathrm{the\; s}}_i^0+a,i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1.$ For an SRS whose bandwidth is b times the minimum SRS bandwidth, the cyclic shift of the two transmission comb configurations is and

$i=\mathrm{0,1},...N_{\mathrm{shift}}^{\mathrm{comb}}-1.$

并分别对每种SRS带宽发送各个传输梳子的偏移参数o_k，从而根据公式

或者 $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ 计算出各个SRS带宽的实际的可用循环移位的值。A fourth way to send information about available cyclic shifts is for the system to send the total number of cyclic shifts used by a transmit comb configuration

And send the offset parameter o _k of each transmission comb for each SRS bandwidth respectively, so that according to the formula

or ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ The actual available cyclic shift value of each SRS bandwidth is calculated.

并分别对每一种SRS带宽发送确定偏移参数o_k的参数c，从而根据公式

或者 $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ 计算出各个SRS带宽的实际的可用循环移位的值，这里o_k满足公式

或者 $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$ A fifth way to send information about available cyclic shifts is for the system to send the total number of cyclic shifts used by a transmit comb configuration

And send the parameter c that determines the offset parameter o _k for each SRS bandwidth respectively, thus according to the formula

or ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ Calculate the actual available cyclic shift value of each SRS bandwidth, where o _k satisfies the formula

or $o_k=\mathrm{round}(k\&Center\; Dot;\frac{N_o}{N_{\mathrm{RPF}}})+c,$

并发送对一个特定的SRS带宽确定偏移参数o_k的参数c，并根据SRS带宽的比例得到其他SRS带宽时确定o_k的参数c。从而根据公式

或者 $s_i^k=\mathrm{round}(i\·\frac{L^B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o^k$ 计算出各个SRS带宽的实际的可用循环移位的值，这里o_k满足公式

或者 $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$

A sixth method of sending information about available cyclic shifts is for the system to send the total number of cyclic shifts used by a transmit comb configuration

And send the parameter c for determining the offset parameter o _k for a specific SRS bandwidth, and obtain the parameter c for determining o _k for other SRS bandwidths according to the ratio of the SRS bandwidth. so that according to the formula

or ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\&Center\; Dot;\frac{L^B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o^k$ Calculate the actual available cyclic shift value of each SRS bandwidth, where o _k satisfies the formula

or $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$

并预定义每一种SRS带宽的用于确定偏移参数o_k的参数c，例如可以预定义c等于0。从而根据公式

或者 $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ 计算出各个SRS带宽的实际的可用循环移位的值，这里o_k满足公式

或者 $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$

The seventh way to send information about available cyclic shifts is for the system to send the total number of cyclic shifts used by a transmit comb configuration

And predefine a parameter c for determining the offset parameter _ok for each SRS bandwidth, for example, c may be predefine to be equal to 0. so that according to the formula

or ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\&Center\; Dot;\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ Calculate the actual available cyclic shift value of each SRS bandwidth, where o _k satisfies the formula

or $o_k=\mathrm{round}(k\&Center\; Dot;\frac{N_o}{N_{\mathrm{RPF}}})+c,$

和确定偏移参数o_k的参数c。从而根据公式

或者 $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ 计算出各个SRS带宽的实际的可用循环移位的值，这里o_k满足公式

或者 $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$

这里和参数c对一般CP帧结构和加长CP帧结构可以不同。The system can predefine the set of cyclic shifts that can be used on each transmission comb, so that this configuration information does not need to be sent in the broadcast channel. One way to predefine is to predefine the total number of cyclic shifts used by a transmit comb configuration

and a parameter c that determines the offset parameter o _k . so that according to the formula

or ${\mathrm{the\; s}}_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k$ Calculate the actual available cyclic shift value of each SRS bandwidth, where o _k satisfies the formula

or $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$

here The parameter c may be different for the general CP frame structure and the extended CP frame structure.

和参数c也可以通过其他系统参数隐含的确定，利用根据小区ID确定本小区采用的

和参数c。The system can also define multiple and parameter c, and index it. In this way, the system can send this index value in a broadcast channel (D-BCH in LTE).

and parameter c can also be determined implicitly by other system parameters, using the cell ID to determine the

and parameter c.

According to the above method of the present invention, the system configures the value of cyclic shift available on each transmission comb. In this way, the mapping relationship can be fixed, that is, a transmission comb uses certain cyclic shift values; in addition, on different uplink symbols for sending SRS signals, the system can change the mapping relationship between available cyclic shifts and transmission combs. For example, when RPF is equal to 2, on uplink symbols at even positions, directly use the configured cyclic shift value for each transmission comb, and on uplink symbols at odd positions, exchange the cyclic shift values of two transmission combs value.

The system uses a different cyclic shift of the base sequence for each transmission comb configuration, either by broadcast channel configuration or the predefined method described above. Then, for each user equipment that needs to send SRS, the base station sends its SRS configuration information, including the indication bit of the transmission comb allocated to the user equipment, the bit indicating the cyclic shift, and the like. Note that the set of available cyclic shifts of a transmission comb configured by the system is A, then the bit indicating the cyclic shift is an index to the cyclic shifts in the set A. Next, the base station detects the SRS of the user equipment on the configured SRS resources.

The user equipment receives the information of the cyclic shift of the basic sequence used by each transmission comb in the broadcast channel, or obtains the information of the cyclic shift of the basic sequence used by each transmission comb based on predefined parameters, and obtains the information of the cyclic shift of the basic sequence used by each transmission comb. A set of cyclic shifts of the sequence; then the user equipment receives the configuration information of the base station for its SRS, and obtains parameters such as the cyclic shift used for configuring it according to the indication bits of the transmission comb assigned by it and the bits indicating the cyclic shift, and sends the SRS .

As shown in FIG. 5 , it is a diagram of a base station processing SRS equipment, wherein a cyclic shift information controller module (501) and an SRS configuration information controller module (502) are embodiments of the present invention. First, the base station generates the configuration information of the available cyclic shift of SRS on each transmission comb in module 501, and multiplexes it into the broadcast channel through the physical channel multiplexer module (503); then for each user equipment that needs to send SRS , the module 502 generates the SRS configuration information of the user equipment, and multiplexes it through the module 503; the multiplexed signal output by the module 503 is sent through the sending and receiving device module (504). Next, the base station receives the signal of the user equipment through the module 504, demultiplexes the SRS of the user equipment through the physical channel demultiplexer module (505), and measures the uplink channel state of the user equipment in the SRS detector module (506) .

FIG. 6 is an equipment diagram of user equipment processing SRS, wherein the cyclic shift information parser module (601) and the SRS configuration information parser module (602) are embodiments of the present invention. First, the user equipment receives the signal of the base station through the sending and receiving device module (604), demultiplexes the broadcast information through the physical channel demultiplexer module (603), and analyzes in the module 601 to obtain the available cycle on each transmission comb A set of shifts; demultiplexed by module 603, and analyzed in module 602 to obtain the SRS configuration information of the base station. Next, the user equipment generates an SRS in the SRS generator (606) module according to the configuration information of the base station, multiplexes it through the physical channel multiplexer module (605), and sends it through the module 604.

Solution 2: Configure different basic sequences on different transmission combs

Because the SRS sequence is a sequence obtained by cyclically shifting the basic sequence, in order to reduce the interference system when configuring the SRS, different basic sequences with CAZAC properties are configured on different transmission combs. There is no limit to the configuration on different transmission combs. Whether the cyclic shifts are the same or different. Specifically, for an SRS bandwidth, the system configures the transmission comb k to use the basic sequence C _k , where k=0, 1, . . . N _RPF -1. C _k here is a basic sequence with CAZAC properties that satisfies this SRS bandwidth.

For the LTE system, according to the current discussion, the basic sequences with CAZAC properties are divided into multiple groups, each group contains one or more basic sequences, and the system can configure a cell to use a certain group of basic sequences. When the number of basic sequences in each group is greater than or equal to N _RPF , the N _RPF basic sequences in the group can be simply configured and used on N ^RPF transmission combs respectively. When the number of basic sequences in each group is less than N _RPF , one method is to specify that only a group of basic sequences configured by the system can be used in a cell, and at this time, some or all SRSs on the transmission combs are allowed to use the same basic sequence . When the number of basic sequences in each group is less than N _RPF , another method is to specify that multiple groups of basic sequences can be used in one cell, so as to ensure the basic sequences used on different transmission combs. For example, when N _RPF is equal to 2 and each group has only one basic sequence, one method is to use this basic sequence for both transmission combs; another method is to configure two transmission combs to use the group assigned to the cell A base sequence within a group and a base sequence within another group. For example, if the basic sequence is divided into M groups, and the basic sequence of group m is assigned to this cell, then when N _RPF is equal to 2, the system configures comb 0 to use the basic sequence of group m, and configures comb 1 to use The basic sequence of the mod(m+n, M)th group, where m=0, 1, . . . M-1, n is an integer, and n=1, . . . M-1.

The base station can send the configuration information of the basic sequence of the SRS in the broadcast channel. In the LTE system, this information is generally sent in the dynamic broadcast channel (D-BCH).

Example

This section presents two embodiments of the invention. In order to avoid making the description of this patent too lengthy, in the following description, detailed descriptions of functions or devices that are well known to the public are omitted.

first embodiment

This embodiment describes an example of configuring different cyclic shifts of the basic sequence on different transmission combs in the present invention. Taking the LTE system as an example here, it is assumed that the bandwidth of the SRS is 6 RBs, that is, 72 subcarriers. Since the RPF of the SRS is equal to 2, the length of the basic sequence of the SRS is 36. Affected by factors such as channel time spread, it is assumed here that the number of user equipments that can be multiplexed simultaneously by CDMA on each transmission comb is 6, that is, the number of cyclic shifts used simultaneously on one comb is 6.

等于6，o_k由公式

确定，这里进一步假设c等于0，其中N_o等于6，N_RPF等于2。如表1所示，是系统配置每个传输梳子上使用的循环移位的值。这里，“√”表示相应的循环移位在一个传输梳子上使用。梳子0上配置使用的循环移位的值是0、6、12、18、24和30；梳子1上配置使用的循环移位的值是3，9，15，21，27和33。According to the formula ${\mathrm{the\; s}}_i^k=i\&Center\; Dot;\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}}+o_k$ Calculate the value of the cyclic shift used for each transmission comb configuration, L _B equals 36,

is equal to 6, o _k is given by the formula

OK, here it is further assumed that c is equal to 0, where N _o is equal to 6, and N _RPF is equal to 2. As shown in Table 1, it is the value of the cyclic shift used on each transmission comb in the system configuration. Here, "√" indicates that the corresponding cyclic shift is used on one transmission comb. The cyclic shift values configured on comb 0 are 0, 6, 12, 18, 24, and 30; the cyclic shift values configured on comb 1 are 3, 9, 15, 21, 27, and 33.

Table 1: Cyclic shifts for each transmission comb configuration

second embodiment

Another example of configuring different cyclic shifts of the basic sequence on different transmission combs in the present invention is described in this embodiment. Taking the LTE system as an example here, it is assumed that the bandwidth of the SRS is 6 RBs, that is, 72 subcarriers. Since the RPF of the SRS is equal to 2, the length of the basic sequence of the SRS is 36. It is further assumed here that the basic sequence with a length of 36 is obtained by cyclically extending the CAZAC sequence with a length of 31, so actually the number of available cyclic extensions for the basic sequence is 31. Affected by factors such as channel time spread, it is assumed here that the number of user equipments that can be multiplexed simultaneously by CDMA on each transmission comb is 6, that is, the number of cyclic shifts used simultaneously on one comb is 6.

计算每个传输梳子配置使用的循环移位的值，L_B等于31，

等于6，o_k由公式

确定，这里假设c等于0，其中N_o等于5，N_RPF等于2。如表2所示，是系统配置每个传输梳子上使用的循环移位的值。这里，“√”表示相应的循环移位在一个传输梳子上使用。梳子0上配置使用的循环移位的值是0、5、10、15、20和25；梳子1上配置使用的循环移位的值是2，7，12，17，22和27。According to the formula

Calculate the value of the cyclic shift used for each transmission comb configuration, L _B equals 31,

is equal to 6, o _k is given by the formula

OK, assume that c is equal to 0, where N _o is equal to 5, and N _RPF is equal to 2. As shown in Table 2, it is the value of the cyclic shift used on each transmission comb in the system configuration. Here, "√" indicates that the corresponding cyclic shift is used on one transmission comb. The cyclic shift values configured on comb 0 are 0, 5, 10, 15, 20, and 25; the cyclic shift values configured on comb 1 are 2, 7, 12, 17, 22, and 27.

Table 2: Cyclic shifts for each transmission comb configuration

Claims (30)

1. the method for a base station treatment S RS comprises the steps:

A) the SRS parameter of system configuration sub-district is included as the different cyclic shift that each transmission comb disposes basic sequence;

B) base station sends the SRS configuration information to subscriber equipment, comprises the indication bit and the bit of indicating cyclic shift of the transmission comb of distributing user equipment;

C) SRS of subscriber equipment is detected in the base station.

2. method according to claim 1 is characterized in that in step a), the different identical basic sequences of transmission comb configuration.

3. method according to claim 1 is characterized in that in step a), the different different basic sequences of transmission comb configuration.

4. method according to claim 1 is characterized in that in step a), and formula is satisfied in k each available cycles displacement of transmitting on the comb

Here, L _BBe the sum of the available cycles displacement of basic sequence,

Be the number of an available cycles displacement on the transmission comb, o _kIt is the deviant of the cyclic shift of each transmission comb configuration.

5. method according to claim 1 is characterized in that in step a), and formula is satisfied in k each available cycles displacement of transmitting on the comb $s_i^k=\mathrm{round}(i\·\frac{L_B}{N_{\mathrm{shift}}^{\mathrm{comb}}})+o_k,$ Here, L _BBe the sum of the available cycles displacement of basic sequence,

Be the number of an available cycles displacement on the transmission comb, o _kIt is the deviant of the cyclic shift of each transmission comb configuration.

6. according to claim 4 or 5 described methods, it is characterized in that offset parameter o ^kSatisfy formula Perhaps satisfy formula $o_k=\mathrm{round}(k\·\frac{N_o}{N_{\mathrm{RPF}}})+c,$ Here

7. method according to claim 1 is characterized in that in step a), and the base station can send the configuration information to the available cycles displacement in broadcast channel, and in the LTE system, this configuration information sends in Dynamic Broadcast Channel (D-BCH).

8. method according to claim 7 is characterized in that, to the bandwidth of each SRS, is each transmission comb, and system sends the numerical value of its operable each cyclic shift respectively.

9. method according to claim 7, it is characterized in that, to the bandwidth of each SRS, system sends the numerical value of each cyclic shift of transmission comb configuration, and sends the increment of the value of other cyclic shifts of transmitting combs with respect to the cyclic shift on this transmission comb.

10. method according to claim 7 is characterized in that,

According to the ratio of SRS bandwidth, determine the ratio of the cyclic shift of its use;

To a specific SRS bandwidth, system sends the numerical value of each cyclic shift of transmission comb configuration, and sends the increment of the value of other cyclic shifts of transmitting combs with respect to the cyclic shift on this transmission comb.

11. method according to claim 7 is characterized in that, system sends the sum of the cyclic shift of a transmission comb configuration use, and respectively every kind of SRS bandwidth is sent the offset parameter of each transmission comb.

12. method according to claim 7 is characterized in that, system sends the sum of the cyclic shift of a transmission comb configuration use, and respectively offset parameter o is determined in each SRS bandwidth transmission _kFormula in parameter c.

13. method according to claim 7 is characterized in that, system sends a transmission comb and disposes the sum of the cyclic shift of using and a specific SRS bandwidth is determined offset parameter o _kParameter c, thereby determine o when obtaining other SRS bandwidth according to the ratio of SRS bandwidth _kParameter c.

14. method according to claim 7 is characterized in that, system sends the sum of the cyclic shift that the configuration of a transmission comb uses, and each SRS bandwidth of predefine be used for determining offset parameter o _kFormula in parameter c.

15. method according to claim 14 is characterized in that parameter c equals 0.

16. method according to claim 7 is characterized in that system definition is multiple

With the combination of parameter c, and it is carried out index, thereby in broadcast channel, send this index value.

17. method according to claim 1 is characterized in that in step a), the set of operable cyclic shift on each transmission comb of system's predefine.

18. method according to claim 17 is characterized in that, sum and definite o of the cyclic shift that the configuration of a transmission of predefine comb is used _kFormula in parameter c.

19. method according to claim 18 is characterized in that,

Is different to general CP frame structure with lengthening CP frame structure with parameter c.

20. method according to claim 1 is characterized in that in step b), the number of the available cycles displacement that the note system disposes on each transmission comb is

Then the base station at the bit number of indication cyclic shift value is $\mathrm{ceil}\left({\log }_2\left(N_{\mathrm{shift}}^{\mathrm{comb}}\right)\right).$

21. the method for a subscriber equipment treatment S RS comprises the steps:

A) subscriber equipment obtains the set that each transmission comb uses the cyclic shift of basic sequence;

B) subscriber equipment receives the configuration information of base station to its SRS;

C) subscriber equipment sends SRS.

22. method according to claim 1 is characterized in that in step a), obtains the cyclic shift that each transmission comb uses basic sequence by receiving broadcast channel.

23. method according to claim 1 is characterized in that in step a), obtains the cyclic shift that each transmission comb uses basic sequence based on predefined parameter.

24. method according to claim 1 is characterized in that in step b), obtains disposing the cyclic shift of its use according to the indication bit of the transmission comb of its distribution and the bit of indication cyclic shift.

25. the equipment of a base station treatment S RS comprises:

A) circular shift information controller module is used to generate the configuration information that the available cycles on each transmission comb is shifted;

B) SRS configuration information controller module is used to generate the SRS configuration information to a subscriber equipment

C) SRS detector module is used to measure the up channel state of subscriber equipment.

26. the equipment of a subscriber equipment treatment S RS comprises:

A) circular shift information parser modules is used to obtain the set of the available cycles displacement on each transmission comb;

B) SRS configuration information parser modules is used to obtain the configuration information of base station to its SRS

C) SRS maker module is used for generating SRS according to the configuration information of base station.

27. a method that disposes SRS comprises the steps:

A) system configuration SRS parameter is included as each transmission comb configuration and uses different basic sequences;

B) base station sends the SRS configuration information to subscriber equipment;

C) subscriber equipment receives the configuration information of base station to SRS, and sends SRS.

28. method according to claim 27 is characterized in that in step a) the number of the basic sequence in the group of each basic sequence is more than or equal to N _RPFThe time, N wherein _RPFIndividual basic sequence is configured in respectively is configured in N _RPFUse on the individual transmission comb.

29. method according to claim 27 is characterized in that in step a) the number of the basic sequence in the group of each basic sequence is less than N _RPFThe time, in a sub-district, use a plurality of groups basic sequence.

30. method according to claim 27 is characterized in that in step a), the base station can send the configuration information to the basic sequence of SRS in broadcast channel, and in the LTE system, this information sends in Dynamic Broadcast Channel (D-BCH).

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