CN104349472B - A kind of descending resource allocation method of wireless communication system - Google Patents

A kind of descending resource allocation method of wireless communication system Download PDF

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CN104349472B
CN104349472B CN201310345502.3A CN201310345502A CN104349472B CN 104349472 B CN104349472 B CN 104349472B CN 201310345502 A CN201310345502 A CN 201310345502A CN 104349472 B CN104349472 B CN 104349472B
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sequence
pcfich
wireless communication
communication system
ofdm symbol
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CN104349472A (en
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王丽
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Potevio Institute of Technology Co Ltd
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Potevio Institute of Technology Co Ltd
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Abstract

This application discloses a kind of descending resource allocation method of wireless communication system, including：The downlink resource of the Non-alignment Frame of the wireless communication system includes 13 orthogonal frequency division multiplex OFDM symbols；Wherein, physical control configured information channel PCFICH accounts for the 1st and the 11st OFDM symbol, Physical HARQ Indicator Channel PHICH accounts for the 2nd and the 12nd OFDM symbol, and remaining 9 OFDM symbol is physical downlink control channel PDCCH or Physical Downlink Shared Channel PDSCH.Application scheme can increase the points for offset estimation, improve the degree of accuracy of offset estimation, and then improve the demodulation performance of down channel.

Description

A kind of descending resource allocation method of wireless communication system
Technical field
The application is related to wireless communication technology field, more particularly to a kind of downlink resource distribution side of wireless communication system Method.
Background technology
A kind of wireless communication system takes discontinuous spectral bandwidth, and its schematic diagram is as shown in Figure 1.Each frequency domain is The physical channel of 25kHz bandwidth is defined as a frequency, at most Individual frequency.Each frequency uses OFDM Technology, all discontinuous frequencies condense together, and system does United Dispatching and distributes to user, and constituting this has carrier aggregation The communication system of characteristic.
The wireless communication system a length of 25ms of radio frames corresponding on each frequency, includes 45 OFDM symbols. As shown in Fig. 2 downlink resource takes 13 OFDM symbols.
Multiple frequencies are divided into two kinds by the wireless communication system according to function, and one kind is synchronous frequency, and another kind is general Passband point.Synchronous frequency major function is to complete synchronization and transmission broadcast message, including descending synchronous signal channel, broadcast Channel and RACH.Common frequency is mainly used in transmission and carrier synchronization and the time synchronized of up-downgoing business.It is general Each channel resource allocation situation in passband point downlink resource is as shown in figure 3, physical control configured information channel（PCFICH）Account for the 1st Individual and the 2nd OFDM symbol, Physical HARQ Indicator Channel（PHICH）Account for the 3rd and the 4th OFDM symbol, physical down control Channel（PDCCH）Or Physical Downlink Shared Channel（PDSCH）Then occupy remaining 9 OFDM symbols, in each OFDM symbol One and only one upper pilot resources block, the pilot resources block of adjacent OFDM symbol are located at adjacent subband respectively.
Wireless communication system PCFICH channel transmission informations have 4 kinds of states, and its coded system is as follows：
CFI_codeword=
[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0;
0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1;
1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1;
1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0,1,1,0];
According to the absolute frequency call number of cell ID and common frequency, the unified generation of 36 bits after being encoded to PCFICH Scrambled after scrambler.
When carrying out channel estimation according to the downlink resource allocative decision shown in Fig. 3, each radio frames can only use pilot tone H1, H2, H3, H11, H12, H13 carry out offset estimation and compensation to channel estimation, because the points for offset estimation are lacked, therefore, , can traffic affecting demodulation performance because offset estimation is forbidden under low signal-to-noise ratio.
The content of the invention
This application provides a kind of descending resource allocation method of wireless communication system, can increase for offset estimation Points, the degree of accuracy of offset estimation is improved, and then improve the demodulation performance of down channel.
The embodiment of the present application provides a kind of descending resource allocation method of wireless communication system, including：
The downlink resource of the Non-alignment Frame of the wireless communication system includes 13 orthogonal frequency division multiplex OFDM symbols；Its In, physical control configured information channel PCFICH accounts for the 1st and the 11st OFDM symbol, and Physical HARQ Indicator Channel PHICH is accounted for 2nd and the 12nd OFDM symbol, remaining 9 OFDM symbol are physical downlink control channel PDCCH or the shared letter of physical down Road PDSCH.
It is preferred that the PCFICH is using following scrambling mode：According to cell ID and the absolute frequency rope of common frequency Quotation marks, front and rear each 18 bit of 36 bits point after being encoded to PCFICH scramble, and front and rear two parts use identical scrambler.
It is preferred that the bit block after PCFICH codings is b (0) ..., b (35), used for first half b (0) ..., b (17) Cell specific scrambling code sequence is scrambled, and forms the bit block of scramblingI.e.Afterwards Half partWherein c (i) is scramble sequence scramble sequence, and c (i) is 31 using length The pseudo-random sequence c (n), n=0,1 ..., M that Gold sequence generation length is 18PN- 1 is defined as：
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein NC=1600, first m-sequence is by x1(0)=1,x1(n)=0, n=1,2 ..., 30 is initialized, second M-sequence byInitialized, the value of initialization is carried out initially according to the following formula when every frame starts Change：
Wherein, SubBandIndex represents absolute frequency Call number,Represent cell ID.
As can be seen from the above technical solutions, by adjusting downlink resource allocative decision, and modification PCFICH scrambling Mode, PCFICH account for the 1st and the 11st OFDM symbol, and front and rear two parts use identical scrambler, the 1st and the 11st OFDM PCFICH channels on symbol send identical information, can carry out offset estimation using the identical information on PCFICH channels. The points of offset estimation increase at 24 points from 6 points.The degree of accuracy of offset estimation can be effectively improved.
Brief description of the drawings
Fig. 1 is a kind of spectrum diagram of wireless communication system；
Fig. 2 is a kind of frequency time interval resource structural representation of wireless communication system；
Fig. 3 is a kind of downlink resource distribution condition schematic diagram of wireless communication system in the prior art；
Fig. 4 is a kind of downlink resource distribution condition schematic diagram for wireless communication system that the embodiment of the present application provides.
Embodiment
The application proposes a kind of descending resource allocation method, by changing PCFICH scrambling mode, can increase and be used for The points of offset estimation, the degree of accuracy of offset estimation is improved, and then improve the demodulation performance of down channel.
To make the technical principle of technical scheme, feature and technique effect clearer, below in conjunction with specific reality Example is applied technical scheme is described in detail.
The downlink resource allocative decision that the embodiment of the present application proposes is as shown in Figure 4.PCFICH accounts for the 1st and the 11st OFDM Symbol, PHICH account for the 2nd and the 12nd OFDM symbol, and remaining 9 OFDM symbol is PDCCH or PDSCH.The pilot tone method of salary distribution It is same as the prior art, i.e., one and only one pilot resources block, the pilot tone of adjacent OFDM symbol in each OFDM symbol Resource block is located at adjacent subband respectively.
The PCFICH scramblings mode that the embodiment of the present application proposes is as follows：According to cell ID and the absolute frequency of common frequency Call number, 36 bits after being encoded to PCFICH are divided in two parts（Each 18 bit）Scrambled, front and rear two parts use phase Same scrambler.
For ease of understanding, a kind of embodiment given below to PCFICH scramblings, the scrambling mode is only used for pair Scheme illustrates, not limiting the protection domain of the application.
Bit block after PCFICH codings is b (0) ..., b (35), wherein first half b (0) ..., b (17) with after Half part b (18) ..., b (35) information are identical, and cell specific scrambling code sequence is used for first half b (0) ..., b (17) Scrambled, form the bit block of scramblingI.e.Latter half
Wherein, the pseudo-random sequence c (n), n that the Gold sequence generation length that scramble sequence c (i) is 31 using length is 18 =0,1,...,MPN- 1 is defined as
C (n)=(x1(n+NC)+x2(n+NC))mod2
x1(n+31)=(x1(n+3)+x1(n))mod2
x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod2
Wherein NC=1600, first m-sequence is by x1(0)=1,x1(n)=0, n=1,2 ..., 30 is initialized, second M-sequence byInitialized, the value of initialization is carried out initially according to the following formula when every frame starts Change：
Wherein, SubBandIndex represents frequency index Value,Represent cell ID.
The scrambler sequence initial value shares 31-bit, including 22-bit mixer, 9-bit cell ID, 22-bit Mixer be made up of following formula：
22-bit mixer=2866×(2*SubBandIndex+1)。
So, because PCFICH is often to transmit, the 1st identical with the PCFICH channels transmission in the 11st OFDM symbol Information, identical information on PCFICH channels can be utilized to carry out offset estimation.The points of offset estimation increase to 24 from 6 points Point.The degree of accuracy of offset estimation can be effectively improved.
The foregoing is only the preferred embodiment of the application, not to limit the protection domain of the application, it is all Within the spirit and principle of technical scheme, any modification, equivalent substitution and improvements done etc., this Shen should be included in Within the scope of please protecting.

Claims (4)

  1. A kind of 1. descending resource allocation method of wireless communication system, it is characterised in that including：
    The downlink resource of the Non-alignment Frame of the wireless communication system includes 13 orthogonal frequency division multiplex OFDM symbols；Wherein, thing Reason control configured information channel PCFICH accounts for the 1st and the 11st OFDM symbol, and Physical HARQ Indicator Channel PHICH accounts for the 2nd With the 12nd OFDM symbol, remaining 9 OFDM symbol is physical downlink control channel PDCCH or Physical Downlink Shared Channel PDSCH。
  2. 2. according to the method for claim 1, it is characterised in that the PCFICH is using following scrambling mode：According to cell The absolute frequency call number of mark and common frequency, front and rear each 18 bit of 36 bits point after being encoded to PCFICH scramble, Front and rear two parts use identical scrambler.
  3. 3. according to the method for claim 2, it is characterised in that the bit block after PCFICH codings is b (0) ..., b (35), scrambled for first half b (0) ..., b (17) using cell specific scrambling code sequence, form the bit block of scramblingI.e.Latter halfWherein c (i) is Scramble sequence.
  4. 4. according to the method for claim 3, it is characterised in that scramble sequence c (i) is given birth to using the Gold sequence that length is 31 Into the pseudo-random sequence c (n) that length is 18, it is defined as：
    C (n)=(x1(n+NC)+x2(n+NC))mod 2
    x1(n+31)=(x1 (n+3)+x1(n))mod 2
    x2(n+31)=(x2(n+3)+x2(n+2)+x2(n+1)+x2(n))mod 2
    Wherein NC=1600, first m-sequence is by x1(0)=1, x1(n)=0, n=1,2 ..., 30 initialized, second M-sequence byInitialized, the value of initialization is carried out initially according to the following formula when every frame starts Change：Wherein, SubBandIndex represents absolute frequency call number,Represent cell ID.
CN201310345502.3A 2013-08-09 2013-08-09 A kind of descending resource allocation method of wireless communication system Expired - Fee Related CN104349472B (en)

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CN106817767B (en) * 2015-12-02 2020-01-07 普天信息技术有限公司 Multi-subband downlink resource allocation method, system and base station of wireless communication system
CN117335927A (en) 2018-05-29 2024-01-02 中兴通讯股份有限公司 Partial pseudo-randomization processing method, corresponding device, equipment and storage medium

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CN101682489A (en) * 2008-02-19 2010-03-24 Lg电子株式会社 Method for mapping physical hybrid automatic repeat request indicator channel
CN102291830A (en) * 2008-04-24 2011-12-21 夏普株式会社 Mobile station device, mobile communication system, and communication method
CN102823182A (en) * 2010-03-25 2012-12-12 Lg电子株式会社 Method and apparatus for transmitting ACK/NACK signals
WO2013015607A3 (en) * 2011-07-27 2013-04-04 Lg Electronics Inc. Sequence mapping method and apparatus in wireless communication system
CN103095625A (en) * 2011-10-27 2013-05-08 普天信息技术研究院有限公司 Scramble initial value collocation method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101682489A (en) * 2008-02-19 2010-03-24 Lg电子株式会社 Method for mapping physical hybrid automatic repeat request indicator channel
CN102291830A (en) * 2008-04-24 2011-12-21 夏普株式会社 Mobile station device, mobile communication system, and communication method
CN102823182A (en) * 2010-03-25 2012-12-12 Lg电子株式会社 Method and apparatus for transmitting ACK/NACK signals
WO2013015607A3 (en) * 2011-07-27 2013-04-04 Lg Electronics Inc. Sequence mapping method and apparatus in wireless communication system
CN103095625A (en) * 2011-10-27 2013-05-08 普天信息技术研究院有限公司 Scramble initial value collocation method

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