CN104283823A - Method for determining reference signal received power (RSRP) of communication system - Google Patents

Abstract

A method for determining reference signal received power (RSRP) of a communication system comprises the steps that intersymbol interference between OFDM symbols in synchronizing signals is eliminated to obtain updated synchronizing signals, and the RSRP is determined through the updated synchronizing signals. By means of the method, the RSRP can be measured through the synchronizing signals, and accuracy of the RSRP is improved.

Description

The method of Reference Signal Received Power is determined in a kind of communication system

Technical field

The application relates to communication technical field, more specifically, relates to a kind of method determining Reference Signal Received Power in communication system.

Background technology

The mandate frequency of power telecom network is discrete to be distributed in the frequency range of 223.525MHz ~ 231.65MHz, totally 40, and each bandwidth 25KHz, is referred to as physics subband.Wherein 3 synchronous subbands of conduct, send a synchronizing signal, for Cell searching every a radio frames.

In current power communication system, by pilot tone computing reference Signal reception power (RSRP) of Physical Broadcast Channel (PBCH).RSRP purposes has: in Cell searching flow process by RSRP correspondingly community is resident, carry out cell merge according to switching criterion after measuring adjacent area RSRP.

Current PBCH channel pilot frequency amounts to 13.Due to PBCH channel pilot frequency limited amount, under Complex Channel environment, well can not reflect RSRP, when the judgement of Cell searching persistent district and cell merge, fault rate increases like this.

Summary of the invention

The embodiment of the present invention proposes a kind of method determining Reference Signal Received Power in communication system, synchronizing signal can be utilized to measure RSRP, improve the accuracy of RSRP.

The technical scheme of the embodiment of the present invention is as follows:

Determine a method for Reference Signal Received Power in communication system, described method comprises:

In synchronizing signal, eliminate the intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM obtain upgrading synchronizing signal;

Utilize described renewal synchronizing signal determination Reference Signal Received Power RSRP.

The described intersymbol interference eliminated in synchronizing signal between OFDM symbol obtains upgrading synchronizing signal and comprises: in each OFDM symbol of synchronizing signal, add cyclic prefix CP, obtain upgrading synchronizing signal.

Described synchronizing signal is the first synchronizing signal, describedly in each OFDM symbol of synchronizing signal, add CP comprise: the CP increasing by 3 sampled point length before first OFDM symbol time domain data, increases the CP of 2 sampled point length before other OFDM symbol time domain data.

Described synchronizing signal is the second synchronizing signal, describedly in each OFDM symbol of synchronizing signal, adds CP comprise: the CP increasing by 2 sampled point length before each OFDM symbol time domain data.

Described synchronizing signal is the ratio of the first synchronizing signal and the second synchronizing signal is a/b, a, b are the weighted factor of first, second synchronizing signal respectively, 0 < a≤1,0 < b≤1, describedly in each OFDM symbol of synchronizing signal, add CP comprise:

In the first synchronizing signal: the CP increasing by 3 sampled point length before first OFDM symbol time domain data, before other OFDM symbol time domain data, increase the CP of 2 sampled point length;

In the second synchronizing signal: the CP increasing by 2 sampled point length before each OFDM symbol time domain data.

Describedly described renewal synchronizing signal is utilized to determine that RSRP comprises:

Utilize and determine RSRP at the sampled point number upgrading the described renewal synchronizing signal in synchronizing signal, Measurement bandwidth in an OFDM symbol, the OFDM symbol number upgrading synchronizing signal and channel response.

As can be seen from technique scheme, the intersymbol interference eliminated in synchronizing signal between OFDM symbol obtains upgrading synchronizing signal in embodiments of the present invention; Under same band, have more multi-point sampling due to upgrading synchronizing signal, therefore, utilize described renewal synchronizing signal to determine RSRP.Like this, the synchronizing signal had compared with multi-point sampling can be utilized to measure RSRP, improve the accuracy of RSRP.

Accompanying drawing explanation

Fig. 1 is the method flow schematic diagram determining Reference Signal Received Power in communication system.

Embodiment

Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.

In embodiments of the present invention, due in power telecom network synchronizing signal bandwidth be identical with PBCH channel width.And due to the number of the unnecessary PBCH channel pilot frequency of the sampled point number in synchronizing signal.Therefore, eliminate the intersymbol interference between OFDM symbol in synchronizing signal after, just RSRP can be calculated.The gain of sampling number object can improve the accuracy calculating RSRP.

Be the method flow schematic diagram determining Reference Signal Received Power in communication system see accompanying drawing 1, specifically comprise the following steps:

101, the intersymbol interference eliminated in synchronizing signal between OFDM symbol obtains upgrading synchronizing signal.

In current power communication system, synchronizing channel is made up of the first synchronizing signal (PSC) and the second synchronizing signal (SSC).In time domain, the second synchronizing signal is arranged in front, and takies 462 sampled points.After first synchronizing signal is placed on the second synchronizing signal, take 463 sampled points.Two synchronizing signals join end to end, and form 925 sampled points (925 time-domain samplings being each subband 13 OFDM symbol are counted).

First synchronizing signal is generated by Zadoff-Chu sequence, first synchronizing signal of 62 length is divided into 7 sections, the length of every section is respectively 6,10,10,10,10,10,6 subcarriers, and be mapped in 7 OFDM symbol respectively, two ends are the OFDM symbol accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbol is 64 IFFT respectively, generates the time domain data of 448 sampled points.Finally unification adds 15 CP totally 463 sampled points.

The binary sequence that second synchronizing signal is 31 by two length serial connection of interlocking is formed.Second synchronizing signal of 62 length is divided into 7 sections, and the length of every section is respectively 6,10,10,10,10,10,6 subcarriers, and be mapped in 7 OFDM symbol respectively, two ends are the OFDM symbol accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbol is 64 IFFT respectively, generates the time domain data of 448 sampled points.Finally unification adds 14 CP totally 462 sampled points.

When current synchronizing signal generates, because timing error can cause intersymbol interference between each OFDM symbol, therefore utilize synchronizing signal determine RSRP before need to eliminate the intersymbol interference between OFDM symbol.Namely in each OFDM symbol of synchronizing signal, add CP, obtain upgrading synchronizing signal.

When synchronizing signal for calculating RSRP use is the first synchronizing signal, CP can be added in the following ways.

First synchronizing signal is generated by Zadoff-Chu sequence, first synchronizing signal of 62 length is divided into 7 sections, the length of every section is respectively 6,10,10,10,10,10,6 subcarriers, and be mapped in 7 OFDM symbol respectively, two ends are the OFDM symbol accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbol is 64 IFFT respectively, adds 3 points before first OFDM symbol time domain data, adds 2 CP, totally 463 sampled points before all the other each OFDM symbol time domain datas.

When synchronizing signal for calculating RSRP use is the second synchronizing signal, CP can be added in the following ways.

The binary sequence that second synchronizing signal is 31 by two length serial connection of interlocking is formed, second synchronizing signal of 62 length is divided into 7 sections, the length of every section is respectively 6,10,10,10,10,10,6 subcarriers, be mapped in 7 OFDM symbol respectively, two ends are the OFDM symbol accounting for 6 subcarriers.The frequency domain data of 7 OFDM symbol is 64 IFFT respectively, adds 2 CP before each OFDM symbol time domain data, totally 462 sampled points.

For calculate RSRP use synchronizing signal be the first synchronizing signal and the second synchronizing signal time, the weighted average of synchronizing signal and the second synchronizing signal can be utilized to determine RSRP, namely the ratio of the first synchronizing signal and the second synchronizing signal is a/b, a, b is the weighted factor of first, second synchronizing signal respectively, 0 < a≤1,0 < b≤1.

For the first synchronizing signal, before first OFDM symbol time domain data, increase the CP of 3 sampled point length, before other OFDM symbol time domain data, increase the CP of 2 sampled point length.

For in the second synchronizing signal: the CP increasing by 2 sampled point length before each OFDM symbol time domain data.

102, in cell search process, renewal synchronizing signal is utilized to determine RSRP.The renewal synchronizing signal sent is: X _{k, l}, K is the sampled point number of the described renewal synchronizing signal in Measurement bandwidth in an OFDM symbol, and L is the OFDM symbol number upgrading synchronizing signal, H _k,Lit is channel response.Because X is constant modulus signals, then have:

$\mathrm{RSRP}=\frac{1}{K}*\frac{1}{L}\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{L}{\mathrm{\&Sigma;}}}{\left|\right|X_{k,l}{H}_{k,l}\left|\right|}^2=\frac{1}{K}\&CenterDot;\frac{1}{L}\underset{k=1}{\overset{K}{\mathrm{\&Sigma;}}}\underset{l=1}{\overset{L}{\mathrm{\&Sigma;}}}{\left|\right|{\hat{H}}_{k.l}\left|\right|}^2.$

The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.

Claims (6)

1. determine a method for Reference Signal Received Power in communication system, it is characterized in that, described method comprises:

In synchronizing signal, eliminate the intersymbol intersymbol interference of orthogonal frequency division multiplex OFDM obtain upgrading synchronizing signal;

Utilize described renewal synchronizing signal determination Reference Signal Received Power RSRP.

2. determine the method for Reference Signal Received Power according to claim 1 in communication system, it is characterized in that, the described intersymbol interference eliminated in synchronizing signal between OFDM symbol obtains upgrading synchronizing signal and comprises: in each OFDM symbol of synchronizing signal, add cyclic prefix CP, obtain upgrading synchronizing signal.

3. in communication system according to claim 1 or 2, determine the method for Reference Signal Received Power, it is characterized in that, described synchronizing signal is the first synchronizing signal, describedly in each OFDM symbol of synchronizing signal, add CP comprise: the CP increasing by 3 sampled point length before first OFDM symbol time domain data, increases the CP of 2 sampled point length before other OFDM symbol time domain data.

4. in communication system according to claim 1 or 2, determine the method for Reference Signal Received Power, it is characterized in that, described synchronizing signal is the second synchronizing signal, describedly in each OFDM symbol of synchronizing signal, adds CP comprise: the CP increasing by 2 sampled point length before each OFDM symbol time domain data.

5. in communication system according to claim 1 or 2, determine the method for Reference Signal Received Power, it is characterized in that, described synchronizing signal is the ratio of the first synchronizing signal and the second synchronizing signal is a/b, a, b is the weighted factor of first, second synchronizing signal respectively, 0 < a≤1,0 < b≤1, describedly in each OFDM symbol of synchronizing signal, add CP comprise:

In the first synchronizing signal: the CP increasing by 3 sampled point length before first OFDM symbol time domain data, before other OFDM symbol time domain data, increase the CP of 2 sampled point length;

In the second synchronizing signal: the CP increasing by 2 sampled point length before each OFDM symbol time domain data.

6. determine the method for Reference Signal Received Power according to claim 1 in communication system, it is characterized in that, describedly utilize described renewal synchronizing signal to determine that RSRP comprises:

Utilize and determine RSRP at the sampled point number upgrading the described renewal synchronizing signal in synchronizing signal, Measurement bandwidth in an OFDM symbol, the OFDM symbol number upgrading synchronizing signal and channel response.