CN101188454B - Enhancing method for system pilot code and initial access processing method of 802.16m system terminal - Google Patents
Enhancing method for system pilot code and initial access processing method of 802.16m system terminal Download PDFInfo
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- CN101188454B CN101188454B CN2007103015600A CN200710301560A CN101188454B CN 101188454 B CN101188454 B CN 101188454B CN 2007103015600 A CN2007103015600 A CN 2007103015600A CN 200710301560 A CN200710301560 A CN 200710301560A CN 101188454 B CN101188454 B CN 101188454B
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Abstract
The invention discloses a system lead code strengthening method and an 802.16m system terminal initial access treatment method. The strengthening method is used for the evolution of an 802.16c system towards an 802.16m system, and includes a step S110 and a step S120, wherein, the step S110 uses the lead code of the 802.16m system that is arranged in the first symbol of downlink sub-frame of the downlink link of the 802.16e system and the lead code of the 802.16e system that is arranged on the second symbol of the downlink sub-frame, so as to lead the terminal of the 802.16m system to be accessed into the 802.16e system; in the step S120, the 802.16m system cancels the lead code of the 802.16m system when the terminal of the 802.16m system is successfully accessed into the 802.16e system. The invention is capable of resolving the problems of huge calculation, long access time, small scope of frequency offset adaptation and too large scope of Cell matching due to the initial access of the 802.16m system into the 802.16e system, thereby leading the terminal of the 802.16m system to be fast accessed into the network of the 802.16e system even under high-speed motion circs.
Description
Technical field
The present invention relates to digital communicating field; Particularly relate to a kind of Enhancement Method of system pilot code and insert (Orthogonal Frequency DivisionMultiplex Access, OFDMA) the initial access processing method at the terminal of the 802.16m system of technology based on OFDM.
Background technology
As a kind of multi-carrier transmission pattern; OFDM (Orthogonal FrequencyDivision Multiplexing, OFDM) converts one group of low-speed parallel data flow transmitted into through the data flow with a high-speed transfer, and system is reduced the susceptibility of multidiameter fading channel frequency selectivity greatly; And the introducing of CP (Cyclic Prefix); (in addition bandwidth availability ratio is high for Inter-symbol Interference, ability ISI), realize that characteristics such as simple make OFDM more and more wider in the application of wireless communication field further to have strengthened the anti-intersymbol interference of system again; Such as; Wlan system all is based on the system of OFDM technology based on WiMax (Worldwide Interoperability for Microwave Access, the micro-wave access to global intercommunication) system of OFDMA and next generation mobile communication system etc.
User side is when receiving; To do earlier synchronously; Therefore to transmit all known signal in two ends, be called preamble (lead code), provide user side do thick synchronously, cell ID (sub-district) and Segment (sector) detection, frequency offset estimating, bandwidth information, sampling instant estimation or the like.
There is following problem in the frame preamble of 802.16e (IEEE802.16e) wireless communication system at present:
The employing power detection of 1, pressure type, the big 9dB of Preamble power ratio FCH power, FCH are only to send with lower power;
2, Preamble provides ID Cell, Sengment and bandwidth information, but will from 4 groups respectively be these information of coupling 114 the sequence, amount of calculation is very big;
3, the Preamble that sends of base station has good PN sign indicating number character at frequency domain, but after transforming to time domain, this good PN character has received destruction, and therefore utilizing same Preamble not only to do synchronously thick but also doing essence is complicacy very synchronously;
4, every kind of bandwidth all has 114 kinds of Preamble sign indicating numbers, and bandwidth is different, and the length of Preamble sign indicating number is also different.According to this kind design, portable terminal needs very large amount of calculation in order to obtain system bandwidth;
5, the WiMAX system design utilizes the frequency offset scope of CP estimation too little, has only Δ f/2, and wherein Δ f is the subcarrier width of ofdm system, and the frequency offset estimation performance is also good inadequately.
In order to satisfy the evolution demand of 802.16e wireless communication system to 802.16m (IEEE802.16m) wireless communication system, need design again the lead code of 802.16e wireless communication system, perhaps strengthen.
Summary of the invention
In view of above-mentioned technical problem; The object of the present invention is to provide a kind of Enhancement Method of system pilot code and the initial access processing method of 802.16m system terminal; It is on the basis of 802.16e wireless communication system lead code; Design 802.16m wireless communication system lead code is to solve 802.16e wireless communication system existing problem when the evolution of 802.16m wireless communication system.The terminal initial that can solve the 802.16m system particularly inserts the problem that amount of calculation is big, turn-on time long, frequency deviation accommodation is little, the Cell matching range is excessive that the 802.16e system is brought, even make the 802.16m terminal of wireless communication system under the situation of high-speed mobile, also can insert the network of 802.16e system fast.
The Enhancement Method of system pilot code according to a first aspect of the invention; Be used for of the evolution of 802.16e system to the 802.16m system; May further comprise the steps: step S110; The lead code that utilization is placed on the lead code of the 802.16m system in first symbol of descending sub frame of down link of 802.16e system and is placed on the 802.16e system on second symbol of descending sub frame makes the terminal of 802.16m system insert the 802.16e system; Step S120, when the success of 802.16e system is inserted at the terminal of 802.16m system, the lead code of cancellation 802.16m system of 802.16m system.
In the Enhancement Method of above-mentioned system pilot code, the lead code of in first symbol, placing the 802.16m system comprises following process: step S202, generates M group id sequence, and wherein, M is the integer more than or equal to 1; Step S204 generates N bandwidth sequence, and wherein, N is the integer more than or equal to 1; Step S206 is inserted into N bandwidth sequence of M group id sequence that generates and generation in first symbol.
In the Enhancement Method of above-mentioned system pilot code, among the step S202, each group id sequence is represented a group; Comprise M1 sub-district (cellular cell) in each group; Each group id sequence has cross-correlation and autocorrelation performance, and the sub-district in each group is adjacent, and all sub-districts identical group id sequences of emission in same group are so that produce transmit diversity; Wherein, M1 is the integer more than or equal to 1.
In the Enhancement Method of above-mentioned system pilot code; In step S204; Each bandwidth sequence is represented a system bandwidth; Comprise N1 sub-district in each bandwidth, each bandwidth sequence has good cross-correlation and autocorrelation performance, and all sub-district identical bandwidth sequences of emission of identical systems bandwidth are so that produce transmit diversity.
In the Enhancement Method of above-mentioned system pilot code, in step S206, be divided into odd subcarriers and even subcarriers to all subcarriers of first symbol, group id sequence and bandwidth sequence are all inserted odd subcarriers or even subcarriers.
In the Enhancement Method of above-mentioned system pilot code, be placed on second symbol according to the lead code of 802.16e agreement with the 802.16e system.
In the Enhancement Method of above-mentioned system pilot code, the lead code of 802.16m is aspect frequency-domain structure, and group id sequence and bandwidth sequence are placed in the both sides of cell system bandwidth, occupy the bandwidth of 10M altogether.
In the Enhancement Method of above-mentioned system pilot code, the lead code of 802.16m, is made up of two parts that repeat front and back in the cycle of a symbol in the time domain structure aspects.
The initial access processing method at the terminal of 802.16m system according to a further aspect of the invention; Utilize the Enhancement Method of above-mentioned described system pilot code to make the 802.16m system terminal initially be linked into the 802.16e system; May further comprise the steps: step S610, carry out time, Frequency Synchronization; Step S620, deciphering group information and bandwidth information obtain group information and bandwidth information that the 802.16e system terminal belongs to the base station; Step S630; Understand cell information and sector auxiliary information; Utilize and separate the group information that reads out among the step S620 and bandwidth information selects the sequence in the corresponding 802.16e agreement to mate as the information in local sequence and second symbol, to obtain cell information and the sector auxiliary information that the 802.16m terminal belongs to.
In the initial access processing method at the terminal of above-mentioned 802.16m system; In step S620; First symbol transition of the descending sub frame of 802.16e system to frequency; Utilize M group id sequence and N bandwidth sequence to mate through the information in first symbol of conversion being come at frequency domain; Draw group id sequence and the bandwidth sequence that use base station, 802.16m system terminal place, thereby obtain the group id information and the bandwidth information of base station, 802.16e system terminal place.
According to the Enhancement Method of system pilot code of the present invention and the initial access processing method of 802.16m system terminal, the terminal initial that can solve the 802.16m system inserts the problem that amount of calculation is big, turn-on time long, frequency deviation accommodation is little, the Cell matching range is excessive that the 802.16e system is brought.And, through the previous symbol that belongs to symbol in former lead code new enhancing lead code is set, design the lead code with PN sequence of time domain symmetry simultaneously, improved the detection probability of lead code, improved the accommodation of system to frequency shift (FS).Through the introducing of cell group message and bandwidth information, the quick access under the high-speed mobile situation that the system that makes supports.
Other features and advantages of the present invention will be set forth in specification subsequently, and, partly from specification, become obvious, perhaps understand through embodiment of the present invention.The object of the invention can be realized through the structure that in the specification of being write, claims and accompanying drawing, is particularly pointed out and obtained with other advantages.
Description of drawings
Accompanying drawing is used to provide further understanding of the present invention, and constitutes the part of specification, is used to explain the present invention with embodiments of the invention, is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 is the flow chart of first embodiment of the Enhancement Method of system pilot code of the present invention;
Fig. 2 is a flow chart of in first symbol, placing the lead code of 802.16m system;
Fig. 3 is a 802.16e wireless communication system frame structure sketch map;
Fig. 4 is the 802.16m wireless communication system frame structure sketch map that has adopted Enhancement Method;
Fig. 5 (a) is the frequency domain characteristic sketch map of lead code in the 802.16m wireless communication system frame structure; Fig. 5 (b) is the time domain specification sketch map of lead code in the 802.16m wireless communication system frame structure;
Fig. 6 is the flow chart of an embodiment of initial access processing method at the terminal of 802.16m system.
Embodiment
Below in conjunction with accompanying drawing the preferred embodiments of the present invention are described, should be appreciated that preferred embodiment described herein only is used for explanation and explains the present invention, and be not used in qualification the present invention.
Fig. 1 is the flow chart of first embodiment of the Enhancement Method of system pilot code of the present invention; As shown in Figure 1; Comprise in the present embodiment: step S110; The lead code that utilization is placed on the lead code of the 802.16m system in first symbol of descending sub frame of down link of 802.16e system and is placed on the 802.16e system on second symbol of descending sub frame makes the terminal of 802.16m system insert the 802.16e system; Step S120, when the success of 802.16e system is inserted at the terminal of 802.16m system, the lead code of cancellation 802.16m system of 802.16m system.
Fig. 2 is the flow chart of in first symbol, placing the lead code of 802.16m system, and is as shown in Figure 2, comprises following process: step S202, generates M group id sequence, and wherein, M is the integer more than or equal to 1; Step S204 generates N bandwidth sequence, and wherein, N is the integer more than or equal to 1; Step S206 is inserted into N bandwidth sequence of M group id sequence that generates and generation in first symbol.
Wherein, In the step S202 that generates M Group_ID (group id number) sequence, each sequence has been represented a Group, can comprise M1 Cell (sub-district among each Group; Cellular cell); Require these Group_ID sequences to have good cross-correlation and autocorrelation performance, require the Cell in a Group should be adjacent simultaneously, and with all Cell identical Group_ID sequences of emission among the Group so that produce transmit diversity.
In the step S204 that generates N BW_ID (bandwidth number) sequence; Each sequence has been represented a system bandwidth; Comprise N1 cell in each bandwidth; Require these BW_ID (bandwidth number) sequence to have good cross-correlation and autocorrelation performance, identical N1 the Cell identical BW_ID sequence of emission of all system bandwidths is so that produce transmit diversity.
The M that is generated in step 202 and the step 204 Group_ID sequence and the individual BW_ID sequence of N, be inserted in first symbol (OFDMA symbol, OFDM symbol) of down link descending sub frame.Be divided into odd subcarriers and even subcarriers to all subcarriers of first symbol, above-mentioned sequence is all inserted odd subcarriers or is all inserted even subcarriers, can not partly insert odd subcarriers, and part is inserted even subcarriers.
Be placed on the lead code of 802.16e wireless communication system on second symbol of down link, the number of placement and insertion method are according to the related content in the 802.16e agreement.
Fig. 3 is a 802.16e wireless communication system frame structure sketch map, and wherein, descending sub frame comprises three part: Preamble (lead code), broadcast control information (FCH, DL-MAP, UL-MAP) and downlink data burst.
Preamble is positioned at first OFDM symbol of radio frames, also is the initial of descending sub frame.Utilize the conjugate symmetry of Preamble or the high power characteristic of preable to detect the position of preamble, and then obtain the original position of frame.
Utilize the CP (Cyclic Prefix) of OFDM and the repeat property detection frequency offset of back data, utilize the frequency offset that detects to compensate to received signal then.
To frequency domain and local, obtain cell_ID, Segment and bandwidth information to the Preamble signal transformation that receives with reference to Preamble signal cross-correlation.
Fig. 4 is the 802.16m wireless communication system frame structure sketch map that has adopted Enhancement Method; As shown in Figure 4; Former lead code and the fixed-site of lead code in radio frames that increases newly; Wherein, first symbol is the 16m lead code that increases newly in the wireless frame structure, and second symbol is the lead code of former 802.16e.
Wherein, Fig. 5 (a) and Fig. 5 (b) are respectively the structure of lead code in frequency domain and time domain.Aspect frequency-domain structure; Group_ID sequence and BW_ID sequence are placed in the both sides of cell system bandwidth; Occupy the bandwidth of 10M altogether, but the Group_ID sequence occupies the even subcarriers from 86 to No. 256, the BW_ID sequence occupies from 682 to 938 even subcarriers; The length of Group_ID sequence and BW_ID sequence all is 128bit, and former preamble sequence is placed according to the 802.16e agreement at second symbol.
In the time domain structure aspects, in the cycle of an OFDM symbol, form by two parts that repeat front and back.
Produce 8 Group_ID sequences in the present embodiment and be used for being divided into 8 Group to 32 ID_Cell among the 802.16e, comprised 4 adjacent IDCell among each Group.
Produce 4 BW_ID sequences in the present embodiment and be used for representing FFT different among the 802.16e count (128,512,1024,2048).
The top sequence that produces has good cross-correlation and autocorrelation performance.
802.16m leading symbol is formed according to the method described above according to IDCell, the system bandwidth of oneself, the Group and the Segment information at place in the base station of wireless communication system.
Fig. 6 is the flow chart of an embodiment of initial access processing method at the terminal of 802.16m system.As shown in Figure 6, portable terminal is done following processing after receiving signal:
Step S610 carries out time, Frequency Synchronization: because all data of first symbol of downlink frame so have repeat property after being transformed into time domain, can utilize this repeat property to carry out time, Frequency Synchronization all in even subcarriers.
Step S620; Understand Group and BW information: after time, the Frequency Synchronization; Utilize 1024 FFT first symbol transition to frequency; Utilize Group_ID sequence of 8 this locality and the BW_ID sequence of 4 this locality to mate Group_ID sequence and the BW_ID sequence that draws the base station use of place, terminal, thereby obtain the Group and the BW information of base station, place, terminal with the information of changing in first symbol of coming.
Step S630; Understand IDCell and Segment information: utilize the Group information that solves and BW information to select in the corresponding 802.16e agreement 12 sequences to mate, thereby obtain IDCell that the terminal belongs to and the information of Segment as the information in local sequence and second symbol according to sorting algorithm.
The method that terminal initial inserts has many kinds, and this patent does not limit the terminal and understands the leading deciphering method that this patent designed.
In sum; According to the Enhancement Method of system pilot code of the present invention and the initial access processing method of 802.16m system terminal, the terminal initial that can solve the 802.16m system inserts the problem that amount of calculation is big, turn-on time long, frequency deviation accommodation is little, the Cell matching range is excessive that the 802.16e system is brought.And, through the previous symbol that belongs to symbol in former lead code new enhancing lead code is set, design the lead code with PN sequence of time domain symmetry simultaneously, improved the detection probability of lead code, improved the accommodation of system to frequency shift (FS).Through the introducing of cell group message and bandwidth information, the quick access under the high-speed mobile situation that the system that makes supports.
The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (7)
1. the Enhancement Method of a system pilot code is used for the evolution of 802.16e system to the 802.16m system, it is characterized in that, may further comprise the steps:
Step S110; The lead code that utilization is placed on the lead code of the said 802.16m system in first symbol of descending sub frame of down link of said 802.16e system and is placed on the said 802.16e system on second symbol of said descending sub frame makes the terminal of said 802.16m system insert said 802.16e system;
Step S120, when said 802.16e system was successfully inserted at the terminal of said 802.16m system, said 802.16m system cancelled the lead code of said 802.16m system;
Wherein, the lead code of the said 802.16m of placement system comprises following process: step S202 in said first symbol, generates M group id sequence, and wherein, M is the integer more than or equal to 1; Step S204 generates N bandwidth sequence, and wherein, N is the integer more than or equal to 1; Step S206; N said bandwidth sequence of the M that generates a said group id sequence and generation is inserted in said first symbol; Wherein, Be divided into odd subcarriers and even subcarriers to all subcarriers of said first symbol, M group id sequence of said generation and N bandwidth sequence of said generation are all inserted said odd subcarriers or all inserted said even subcarriers;
Wherein, be placed on said second symbol according to the lead code of 802.16e agreement said 802.16e system.
2. the Enhancement Method of system pilot code according to claim 1 is characterized in that:
In said step S202; Each said group id sequence is represented a group, comprises M1 sub-district in each said group, and each said group id sequence has cross-correlation and autocorrelation performance; Sub-district in each group is adjacent; All sub-district identical group id sequences of emission in same group are so that produce transmit diversity, and wherein, M1 is the integer more than or equal to 1.
3. the Enhancement Method of system pilot code according to claim 1 is characterized in that:
In said step S204; Each said bandwidth sequence is represented a system bandwidth; Comprise N1 sub-district in each said bandwidth; Each said bandwidth sequence has good cross-correlation and autocorrelation performance, and all sub-district identical bandwidth sequences of emission of identical systems bandwidth are so that produce transmit diversity.
4. the Enhancement Method of system pilot code according to claim 1 is characterized in that:
In said step S206, be divided into odd subcarriers and even subcarriers to all subcarriers of said first symbol, said group id sequence and said bandwidth sequence are all inserted said odd subcarriers or said even subcarriers.
5. according to the Enhancement Method of each described system pilot code in the claim 1 to 4, it is characterized in that:
The lead code of said 802.16m is aspect frequency-domain structure, and said group id sequence and said bandwidth sequence are placed in the both sides of cell system bandwidth, occupies the bandwidth of 10M altogether.
6. according to the Enhancement Method of each described system pilot code in the claim 1 to 4, it is characterized in that:
The lead code of said 802.16m, is made up of two parts that repeat front and back in the cycle of a symbol in the time domain structure aspects.
7. the initial access processing method of a 802.16m system terminal utilizes that the Enhancement Method of each described system pilot code makes said 802.16m system terminal initially be linked into the 802.16e system in the claim 1 to 8, it is characterized in that, may further comprise the steps:
Step S610 carries out time, Frequency Synchronization;
Step S620, deciphering group information and bandwidth information obtain group information and bandwidth information that said 802.16e system terminal belongs to the base station;
Wherein, In said step S620; Utilize 1024 FFT first symbol transition of the descending sub frame of said 802.16e system to frequency; Utilize M group id sequence and N bandwidth sequence to mate, draw group id sequence and the bandwidth sequence that use base station, said 802.16m system terminal place, thereby obtain the group information and the bandwidth information of base station, said 802.16e system terminal place through the information in said first symbol of conversion being come at frequency domain;
Step S630; Understand cell information and sector auxiliary information; Be utilized in and separate said group of information reading out among the said step S620 and said bandwidth information selects the sequence in the corresponding 802.16e agreement to mate as the information in local sequence and second symbol, to obtain said cell information and the said sector auxiliary information that said 802.16m terminal belongs to.
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| JP2010258599A (en) * | 2009-04-22 | 2010-11-11 | Sony Corp | Wireless communication apparatus, wireless communication method, computer program, and wireless communication system |
| CN101938441B (en) * | 2009-06-29 | 2014-05-07 | 中兴通讯股份有限公司南京分公司 | Synchronization sequence sending and receiving methods for realizing synchronous access and corresponding device |
| US8483132B2 (en) * | 2009-12-04 | 2013-07-09 | Intel Corporation | Apparatus and methods for upgrading an airlink in a wireless system |
| CN107294894B (en) * | 2016-03-31 | 2020-06-09 | 中国科学院上海高等研究院 | Method and system for generating, sending and receiving preamble signal |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1988525A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for orthogonal frequency division multiplex system |
| CN1996985A (en) * | 2006-06-26 | 2007-07-11 | 浙江大学 | Method and device for downlink frame synchronization |
| CN101035103A (en) * | 2006-03-09 | 2007-09-12 | 华为技术有限公司 | Pilot code generation method and device of the orthogonal frequency division multiplexing access system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1988525A (en) * | 2005-12-23 | 2007-06-27 | 中兴通讯股份有限公司 | Synchronizing method for orthogonal frequency division multiplex system |
| CN101035103A (en) * | 2006-03-09 | 2007-09-12 | 华为技术有限公司 | Pilot code generation method and device of the orthogonal frequency division multiplexing access system |
| CN1996985A (en) * | 2006-06-26 | 2007-07-11 | 浙江大学 | Method and device for downlink frame synchronization |
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