CN101494918B - terminal access method for WiMAX evolution system - Google Patents
terminal access method for WiMAX evolution system Download PDFInfo
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- CN101494918B CN101494918B CN2008100070013A CN200810007001A CN101494918B CN 101494918 B CN101494918 B CN 101494918B CN 2008100070013 A CN2008100070013 A CN 2008100070013A CN 200810007001 A CN200810007001 A CN 200810007001A CN 101494918 B CN101494918 B CN 101494918B
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Abstract
The invention discloses a terminal access method used in WiMAX evolution system, which comprises: determining the sub-frame combination mode and compatible configuration mode of frame structure in WiMAX evolution system, according to the demand of network planning and WiMAX compatible system; base station setting the sub-frame combination property indication and the sub-frame distribution bitmap indication in the frame control information in the frame structure, according to the sub-frame combination mode and the compatible configuration mode, and sending the frame structure to the terminal of the WiMAX evolution system; and the terminal of the WiMAX evolution system synchronizing according to the lead code exclusively used in the WiMAX evolution system in the frame structure, then acquiring the sub-frame combination mode information exclusively used in the WiMAX evolution system and the sub-frame information exclusively used in the WiMAX evolution system according to the sub-frame combination property indication and the sub-frame distribution bitmap indication, in order to access the WiMAX evolution system.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of frame structure of WiMAX evolution system of terminal access method and backward compatibility of the WiMAX of being used for evolution system.
Background technology
OFDM (Orthogonal Frequency Division Multiplexing; Abbreviation OFDM) system converts the low-speed parallel data flow transmitted into through the data flow with high-speed transfer, and system is reduced the susceptibility of multidiameter fading channel frequency selectivity greatly.Through introducing Cyclic Prefix, OFDM has further strengthened the ability of the anti-intersymbol interference of system.Characteristics such as in addition, bandwidth availability ratio is high, realization is simple make OFDM more and more wider in the application of wireless communication field.Based on orthogonal frequency division multiplexing multiple access (Orthogonal Frequency Division Multiple Access; Abbreviation OFDMA) micro-wave access global inter communication (Worldwide Interoperability for Microwave Access is called for short WiMAX) system just is to use the system of OFDM technology.
Wireless communication technology is in continuous progress, and the market demand also can change simultaneously, and this can absorb these new technology through the process of continuous evolution with regard to requiring standard, satisfies new demand simultaneously.Through the process of this evolution, standard and the system that realizes according to this standard not only can be through its vitality of smooth upgrade continuity, and the existing investment of protection user is more manyed better service but also can provide than old system.Along with the develop rapidly of the communication technology, can not satisfy the demand of following people to high transfer rate, high-throughput, fast moving and the low time delay of wide-band mobile communication based on the mobile WiMAX system of IEEE 802.16e air interface standard.At present, the 16m of IEEE802.16 working group (Task Group m, be called for short TGm) task groups is being devoted to formulate improved air interface specification 802.16m, and this standard can be supported higher peak rate, higher spectrum efficiency and sector capacity.
For the peak value speed that realizes 16m and the performance requirement of high-throughput, the drawback that solves original 16e system-frame design is particularly important.In the frame structure definition of 16e system; A time division multiplexing (Time Division duplex; Abbreviation TDD) frame only comprises a descending sub frame and a sub-frame of uplink; This frame descending sub frame sends the feedback of information and can in the sub-frame of uplink of next frame, send the soonest, and feedback, low business and the function that postpones can not effectively be used in current mobile WiMAX system fast to cause some needs.According to the demand of 16m air interface standard, the frame structure of 16e system must be supported the terminal of existing WiMAX system, need aspect backwards compatibility, consider to some extent.
Summary of the invention
The invention provides a kind of frame structure of WiMAX evolution system of terminal access method and backward compatibility of the WiMAX of being used for evolution system, with WiMAX compatible evolution system and legacy version WiMAX system.
Terminal access method according to the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention comprises: according to the demand of the network planning and WiMAX compatible system; Confirm the subframe compound mode and the compatible configuration mode of the frame structure of WiMAX evolution system; Wherein, The subframe compound mode is meant frame structure which ascending-descending subframes is made up of, and compatible configuration mode is meant that which subframe in the frame structure is exclusively used in the WiMAX evolution system, which subframe is exclusively used in the WiMAX compatible system; The base station is provided with indication of the subframe composite attribute in the frame control message of frame structure and the indication of sub-frame allocation bitmap according to determined subframe compound mode and compatible configuration mode, and frame structure is sent to the terminal of WiMAX evolution system; And the terminal of WiMAX evolution system is after carrying out synchronously according to the lead code that is exclusively used in the WiMAX evolution system in the frame structure; Indicate the information of obtaining the subframe compound mode that is exclusively used in the WiMAX evolution system and the information that is exclusively used in the subframe of WiMAX evolution system according to indication of subframe composite attribute and sub-frame allocation bitmap, to insert the WiMAX evolution system.
Wherein, above-mentioned frame structure comprises: be exclusively used in the WiMAX evolution system one or more descending sub frames, be exclusively used in one or more sub-frame of uplink of WiMAX evolution system, the one or more sub-frame of uplink that are exclusively used in one or more descending sub frames of WiMAX compatible system and are exclusively used in the WiMAX compatible system.
Wherein, first subframe in the above-mentioned frame structure is the descending sub frame that is exclusively used in the WiMAX evolution system.The lead code that is exclusively used in the WiMAX evolution system is arranged in first symbol place of first subframe of above-mentioned frame structure.The frame control message that is exclusively used in the WiMAX evolution system is positioned at after the lead code of the above-mentioned WiMAX of being exclusively used in evolution system.The symbol lengths in the one or more up/descending sub frame of WiMAX evolution system is confirmed to be exclusively used in according to being exclusively used in Cyclic Prefix configuration information in the frame control message of WiMAX evolution system in the base station.The base station is divided the subframe in the above-mentioned frame structure according to time division way.
The application of the invention; Can be according to the service conditions of real network deployment and original WiMAX; From the subframe combination, select best subframe combination to distribute to evolution system and compatible system; On the basis of satisfying advanced international mobile communication (International Mobile Telecommunications-Advanced is called for short IMT-Advanced) systematic function requirement, satisfy the demand at original WiMAX terminal.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the basic composition sketch map according to the frame structure of the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention;
Fig. 2 (a) to Fig. 2 (g) be various subframes combinations and allocation example figure according to the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention; And
Fig. 3 is the flow chart according to the realization flow of the cut-in method of the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention.
Embodiment
Cut-in method according to the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention may further comprise the steps: according to the business demand of the network planning and backward compatible systems, confirm that the subframe compound mode of frame structure and which subframe are used for compatible system; The frame structure transmission is carried out according to the subframe compound mode of confirming in the base station, and indication of subframe composite attribute and sub-frame allocation bitmap (Bitmap) indication in the frame control message are set; After the terminal of evolution system and the lead code of evolution system are synchronous, according to indication of the subframe composite attribute in the frame control message and sub-frame allocation Bitmap, the attribute that the subframe of acquisition system is formed and the subframe time slot of evolution system; After the terminal of compatible system and the lead code of compatible system are synchronous, obtain the descending sub frame and the sub-frame of uplink assignment information of compatible system according to the frame control message of compatible system.
Wherein, above-mentioned frame structure is made up of a plurality of descending sub frames and sub-frame of uplink.First subframe of above-mentioned frame structure is a descending sub frame, and each sub-frame of uplink and descending sub frame are divided according to time division way.Wherein, In order to support the WiMAX system terminal of legacy version; Part descending sub frame in the frame structure of WiMAX evolution system and sub-frame of uplink place time slot keep for the WiMAX system of legacy version to use, and the descending sub frame of the WiMAX system of legacy version and sub-frame of uplink are operated on the descending and sub-frame of uplink place time slot of reservation.Wherein which subframe assignment is to the WiMAX evolution system through the indication of the sub-frame allocation Bitmap in the frame control message, and which subframe is propped up dispensing WiMAX compatible system.
Wherein, first symbol of first descending sub frame is a lead code, and this lead code is used for the synchronous of evolution system.Be that frame is controlled the letter that disappears after first descending sub frame lead code.Each subframe of sub-frame allocation Bitmap indication in the frame control message still is that the WiMAX compatible system is used for the WiMAX evolution system.
Wherein, the descending sub frame of frame structure and sub-frame of uplink have multiple compound mode, indicate the concrete subframe compound mode of notifying in the travelling carriage frame structure through the subframe composite attribute in frame control message.
Wherein, the decoding terminals frame control message of evolution system, obtaining which subframe according to sub-frame allocation Bitmap is that the WiMAX evolution system is used.Only can decode and handle the subframe of distributing to the WiMAX evolution system in the terminal of WiMAX evolution system, for distributing to the used subframe time slot of WiMAX compatible system, does not handle at the terminal of WiMAX evolution system.
The base station is made up according to selected subframe and is carried out the framing processing.For the subframe of WiMAX evolution system, the symbol lengths in the subframe is confirmed according to selected Cyclic Prefix (CP) length configuration information in the base station.For the subframe time slot of distributing to the WiMAX compatible system, carry out framing according to the descending sub frame and the sub-frame of uplink framing mode of WiMAX compatible system.
With reference to accompanying drawing, specify embodiment of the present invention below.
Fig. 1 is the basic composition sketch map according to the tdd frame structure of the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention.The unit frame frame length 10ms of 16m system is made up of with sub-frame of uplink 105 a plurality of descending sub frames 102.The number of the subframe that comprises in the unit frame is configurable, and the length of each subframe is configurable.Can concentrate from basic subframe unit and select different subframes, subframe lengths can be 0.5ms, 1ms or 1.5ms.In the tdd frame structure of WiMAX evolution system was formed, first subframe must be set to descending sub frame; Lead code 101 is positioned at first symbol of first descending sub frame of frame structure, is used for the synchronous of evolution system terminal and base station system.Frame control message 107 is positioned on second symbol of first descending sub frame 102 of frame structure, is used for indicating subframe combined information, CP configuration information and the sub-frame allocation information of 10ms frame.Descending sub frame 104 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 106 place time slots.The downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of reservation.System synchronization is carried out through the lead code on the 16e descending sub frame 103 in the terminal of 16e system.The cycle of 16e system frame structure is 5ms.
Fig. 2 (a) to Fig. 2 (g) be various subframes combinations and allocation example figure according to the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention.
In the subframe combination of Fig. 2 (a), the 10ms of 16m system frame is made up of 10 isometric ascending-descending subframes.The subframe lengths of descending sub frame 202 and sub-frame of uplink 204 is 1ms, and lead code 201 is positioned at first symbol of first descending sub frame of 10ms frame.Descending sub frame 203 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 205 place time slots, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of said reservation.System synchronization is carried out through the lead code on the 16e descending sub frame 206 in the terminal of 16e system.The cycle of 16e system frame structure is 5ms.
In the subframe combination of Fig. 2 (b), the 10ms of 16m system frame also is made up of 10 isometric ascending-descending subframes.The subframe lengths of descending sub frame 207 and sub-frame of uplink 209 is 1ms.Descending sub frame 208 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 210 place time slots, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of reservation.
In the subframe combination of Fig. 2 (c), the 10ms of 16m system frame is made up of 12 not isometric ascending-descending subframes.The subframe lengths of descending sub frame 211 is 0.5ms, and the subframe lengths of descending sub frame 214 is 1.5ms, and the subframe lengths of sub-frame of uplink 213 is 0.5ms.Descending sub frame 212 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 215 place time slots, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of reservation.
In the subframe combination of Fig. 2 (d), the 10ms of 16m system frame also is made up of 12 not isometric ascending-descending subframes.The subframe lengths of descending sub frame 216 is 0.5ms, and the subframe lengths of descending sub frame 219 is 1ms, and the subframe lengths of sub-frame of uplink 218 is 1ms.Descending sub frame 217 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 220 place time slots, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of said reservation.
In the subframe combination of Fig. 2 (e), the 10ms of 16m system frame also is made up of 12 not isometric ascending-descending subframes.The subframe lengths of descending sub frame 221 is 0.5ms, and the subframe lengths of descending sub frame 222 is 1.5ms, and the subframe lengths of descending sub frame 224 is 1ms, and the subframe lengths of sub-frame of uplink 223 is 0.5ms, and the subframe lengths of sub-frame of uplink 225 is 1ms.Descending sub frame 222 in the 16m system frame structure keeps for the 16e system to use with sub-frame of uplink 225 place time slots, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of said reservation.
In the subframe combination of Fig. 2 (f), the 10ms of 16m system frame is made up of 12 not isometric ascending-descending subframes.The subframe lengths of descending sub frame 226,227 and sub-frame of uplink 228,229 is 1ms, and the subframe lengths of descending sub frame 230,231 and sub-frame of uplink 232,233 is 0.5ms.Descending sub frame 227 in the 16m system frame structure, descending sub frame 230, descending sub frame 231 and sub-frame of uplink 229, sub-frame of uplink 232 place time slots keep for the 16e system to use, and the downlink frame of 16e system and uplink frame are operated on the descending and sub-frame of uplink place time slot of said reservation.
Identical among the combination of subframe among Fig. 2 (g) and Fig. 2 (d).Different is, last sub-frame of uplink of 16m system frame structure keeps for the 16e system to use among Fig. 2 (d), and last sub-frame of uplink 234 of 16m frame structure is distributed to the 16m system and used among Fig. 2 (g).
Table one is the subframe Assembly Listing according to the frame structure of the WiMAX evolution system of the embodiment of the invention.
Table one:
Shown in table one, come several kinds of subframe combinations of definition in the presentation graphs 2 through the subframe combination indicating bit of 3 bits.Wherein, Subframe combination indicating bit 000 expression frame structure adopts the subframe compound mode of Fig. 2 (a); Subframe combination indicating bit 001 expression frame structure adopts the subframe compound mode of Fig. 2 (b); Subframe combination indicating bit 010 expression frame structure adopts the subframe compound mode of Fig. 2 (c); Subframe combination indicating bit 011 expression frame structure adopts the subframe compound mode of Fig. 2 (d), and subframe combination indicating bit 100 expression frame structures adopt the subframe compound mode of Fig. 2 (e), and subframe combination indicating bit 101 expression frame structures adopt the subframe compound mode of Fig. 2 (f).
Table two is to form according to the frame control message of the frame structure of the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention.
Table two:
Shown in table two, altogether definition is no more than 8 kinds subframe compound mode, the subframe compound mode of notifying mobile station system to adopt through the subframe composite attribute indicating bit of 3 bits in the frame control message.Defined two kinds of CP length configurations altogether, be respectively short CP configuration and long CP configuration, the long CP configuration of the default employing of each subframe.The CP configuration information indicating bit that in frame control message, comprises 1 bit.If CP configuration indicating bit is 0, frame control message does not carry CP configuration Bitmap, representes that all subframes all adopt long CP configuration mode.If CP configuration indicating bit is 1, frame control message carries CP configuration Bitmap, among the Bitmap each bit corresponding successively from each subframe that first subframe begins the configuring condition of CP, the corresponding Bitmap position of subframe be ' 1 ', expression adopts short CP to dispose.In frame control message, comprise the sub-frame allocation information indication of 1 bit, if the sub-frame allocation information indicating bit is 0, frame control message does not carry sub-frame allocation Bitmap sequence, representes that each subframe is evolution system and uses.If the sub-frame allocation information indicating bit is 1; Frame control message carries sub-frame allocation Bitmap sequence; The corresponding successively frame of each bit operating position from each subframe that first subframe begins among the Bitmap, the corresponding Bitmap of subframe is ' 1 ', representes that this subframe is that compatible system is used.
Fig. 3 is the flow chart according to the cut-in method realization flow of the WiMAX evolution system that is used for backward compatibility of the embodiment of the invention.As shown in Figure 3, this method may further comprise the steps:
S302 according to the business demand of the network planning and backward compatible systems, confirms the subframe compound mode of 16m system frame structure, and confirms that which subframe is used for the 16e system, and which subframe is used for the 16m system.
S304, the frame structure transmission is carried out according to the subframe compound mode of confirming in the 16m base station, and indication of subframe composite attribute and sub-frame allocation Bitmap indication in the frame control message are set.Frame control message in the subframe that the 16m system uses sends through the control messages transmit mechanism of 16m system, and the subframe of distributing to the 16e system is sent according to the frame control message of the 16e system control messages transmit mechanism through the 16e system.
S306, after the terminal of 16m system and 16m lead code were synchronous, according to indication of the subframe composite attribute in the 16m frame control message and sub-frame allocation Bitmap, the subframe that obtains the 16m system was formed the subframe time slot of attribute and evolution system.
S308 after the terminal of 16e system and 16e lead code are synchronous, obtains the descending sub frame and the sub-frame of uplink assignment information of 16e system according to the frame control message of 16e system.
Through the present invention, can select suitable subframe combination according to business model, and rationally carry out sub-frame allocation according to the business model of evolution system and compatible system.This frame structure the more smooth evolution of high bandwidth system communication such as can realize from WiMAX to 4G on the basis of the existing WiMAX of backward compatibility system.
The above is merely embodiments of the 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 the claim scope of the present invention.
Claims (7)
1. a terminal access method that is used for the WiMAX evolution system is characterized in that, comprising:
Demand according to the network planning and WiMAX compatible system; Confirm the subframe compound mode and the compatible configuration mode of the frame structure of WiMAX evolution system; Wherein, Said subframe compound mode is meant said frame structure which ascending-descending subframes is made up of, and said compatible configuration mode is meant that which subframe in the said frame structure is exclusively used in the WiMAX evolution system, which subframe is exclusively used in the WiMAX compatible system;
The base station is provided with indication of the subframe composite attribute in the frame control message of said frame structure and the indication of sub-frame allocation bitmap according to determined subframe compound mode and compatible configuration mode, and said frame structure is sent to the terminal of WiMAX evolution system; And
The terminal of said WiMAX evolution system is after carrying out synchronously according to the lead code that is exclusively used in the WiMAX evolution system in the said frame structure; Indicate the information of obtaining the subframe compound mode that is exclusively used in the WiMAX evolution system and the information that is exclusively used in the subframe of WiMAX evolution system according to said subframe composite attribute indication and said sub-frame allocation bitmap, to insert said WiMAX evolution system.
2. terminal access method according to claim 1; It is characterized in that said frame structure comprises: be exclusively used in the WiMAX evolution system one or more descending sub frames, be exclusively used in one or more sub-frame of uplink of WiMAX evolution system, the one or more sub-frame of uplink that are exclusively used in one or more descending sub frames of WiMAX compatible system and are exclusively used in the WiMAX compatible system.
3. terminal access method according to claim 2 is characterized in that, first subframe in the said frame structure is the descending sub frame of the said WiMAX of being exclusively used in evolution system.
4. terminal access method according to claim 3 is characterized in that, the lead code of the said WiMAX of being exclusively used in evolution system is arranged in first symbol place of first subframe of said frame structure.
5. terminal access method according to claim 4 is characterized in that the frame control message of the said WiMAX of being exclusively used in evolution system is positioned at after the lead code of the said WiMAX of being exclusively used in evolution system.
6. terminal access method according to claim 5; It is characterized in that the symbol lengths in the said one or more up/descending sub frame that is exclusively used in the WiMAX evolution system is confirmed according to the Cyclic Prefix configuration information in the frame control message of the said WiMAX of being exclusively used in evolution system in said base station.
7. according to each described terminal access method in the claim 1 to 6, it is characterized in that said base station is divided the subframe in the said frame structure according to time division way.
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| CN1909533A (en) * | 2005-08-05 | 2007-02-07 | 中兴通讯股份有限公司 | Frame creating method based on crossing frequency division multiplexing in time-division duplex mode |
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