CN1642058B - Wireless link multiplexing method for time-division duplex CDMA mobile communication system - Google Patents
Wireless link multiplexing method for time-division duplex CDMA mobile communication system Download PDFInfo
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Abstract
The invention relates to wireless link multiplexing method of the time division duplexing code division multiple access mobile communication system. The communication system comprises no less than two base stations, many mobile stations; no less than two channel takes up different subframe group in the same spread spectrum, the same frame; one of the channels can take up many spread spectrum code; each of the channel has the free subframe group in one frame; each of the subframe group includes one up subframe, one down subframe, and one up synchronization subframe; different channels are distributed to different users; the mobile station distributed the channel is emitted the signal at the took up respectively up subframe of the subframe group and the up synchronization subframe, receivedthe signal of one of the base station at the took up respectively down subframe of the subframe group; it can be received the signal of the other base station at the down subframe of the free subframe group of the same frame. The invention distributes the free resource of one of channels in the frame to the other channels, and improves the utilization to the wireless resource.
Description
Technical field
The present invention relates to the Radio Link multiplexing method of a kind of time division duplex (TDD) code division multiple access (CDMA) mobile communication system, belong to wireless communication technology field.
Background technology
Existing mobile communications system all is cellular system usually.It is multiplexing that the utilization of cellular system makes that Radio Resource is able in different spaces, power system capacity expanded, but also brought new problem, is exactly handover (handover).So-called handover is meant when the mobile subscriber of an ongoing communication enters neighbor cell from a sub-district, need fast former cell channel be switched to the channel of this neighbor cell under the prerequisite that keeps communication.And it should be transparent that this channel switches, and is not promptly discovered by the user.In the preparatory stage of switching, mobile radio station should not influence itself and the communicating by letter of current base station to the measurement of adjacent base station; In the execution phase of switching, the original channel between mobile radio station and the base station should not interrupted as much as possible in system.
In order to realize monitoring to adjacent base station, in the traffic channel full rate TCH/F of gsm system, establish an empty slot specially, this time slot does not transmit, but is specifically designed to the measurement of mobile radio station to adjacent base station.Referring to Fig. 1, Fig. 1 shows the Traffic Channel TCH/F of a full rate in the gsm system, is made of 26 time slots, and wherein 24 time slots are used for TCH 102; 1 time slot is used for slow associated control channel (SACCH), and promptly time slot 104; An idle time slot 106.At this idle time slot 106, the signal of indicated adjacent base station in the moving station measuring current base station broadcast message.Because crack 106 can not send data at one's leisure, therefore wasted resource to a certain extent.At gsm system, the handoff applications hard-switching technology, mobile radio station can be supspended the emission on former channel, and then sets up channel with adjacent base station, may cause communication discontinuous like this, makes the user hear the sound of similar " snap ".
In addition, in number of C DMA system, IS-95 for example, mobile radio station then use pointer extra in extra RAKE receiver or the RAKE receiver to carry out measurement to the adjacent base station signal.This method has increased the hardware device that is specifically designed to measurement, also will increase the power consumption and the cost of travelling carriage.In IS-95, adopted soft handover, the downstream signal of a plurality of base stations of mobile radio station demodulation simultaneously, the upward signal of mobile radio station has increased the complexity of system and equipment under a plurality of base stations demodulation simultaneously soft changing state, and has wasted channel resource.
Summary of the invention
The object of the present invention is to provide a kind of Radio Link multiplexing method that is used for the time-division duplex communication system, can improve the Radio Link utilance, make full use of Radio Resource.
For realizing above-mentioned goal of the invention, the present invention adopts following technical scheme:
A kind of Radio Link multiplexing method of TDD CDMA mobile communication system, this communication system have at least two base stations and a plurality of mobile radio station, and each mobile radio station utilizes channel and base station communication, it is characterized in that:
Different subframe group (30,31 at least two same spreading codes of the same frame of channel occupancy ... 38), wherein, each subframe group is made of at interval in regular turn a descending sub frame, a uplink synchronous subframe, a sub-frame of uplink and a protection;
This mobile radio station that is assigned to this channel transmits in the sub-frame of uplink and the uplink synchronous subframe of the subframe group that takies separately, receives the signal of present base station at the descending sub frame of the subframe group that takies separately,
This mobile radio station receives from adjacent signal of base station at the descending sub frame of the idle subframe group of same frame, and wherein, the subframe group the subframe group that takies except that himself is the idle subframe group of this mobile radio station.
Preferable, s spreading code to same frame carries out multiplexing r the mobile radio station of distributing to, wherein r, s are positive integer and r＞s 〉=1, each subframe group of same frame is distributed to smaller or equal to r-1 mobile radio station by spreading code is multiplexing, the subframe group of same frame is distributed to t mobile radio station, wherein 2≤t≤r respectively.
Preferable, same channel can take the resource of a plurality of spreading codes of same frame, and under each spreading code, the subframe group of the same frame that it takies is identical.
Preferable, most channels can use identical subframe idle pulley.
Preferable, the base station is a cycle repeated broadcast broadcast message with the q frame, and in different frame, broadcast at the subframe idle pulley of different channels the base station, each frame is also only broadcasted at the subframe idle pulley of a channel, and wherein, q is the subframe idle pulley kind that the base station is selected for use.
Preferable, per 2 spreading codes to same frame carry out multiplexing 3 mobile radio stations of distributing to, the base station is the cycle repeated broadcast with 3 frames, wherein first frame is broadcasted in the idle subframe group (33,37,38) of a mobile radio station, second frame is broadcasted in the idle subframe group (30,31,35) of another mobile radio station, and the 3rd frame in the end idle subframe group (32,34,36) of a mobile radio station is broadcasted.
Preferable, the base station according to System Frame Number divided by the remainder after p * q, cycle repeated broadcast information on inherent Broadcast Control Channel of p * q frame period, wherein p is the number of the shared frame of broadcast message.
Preferable, the adjacent base station synchronization adopts the subframe emission information of non-overlapping copies.
Preferable, have the subframe group at two or more intervals of a same frame of channel occupancy in these two channels at least.
Preferable, this base station uplink synchronous control channel is divided into most subchannels, each subchannel is multiplexed into a descending sub frame by different spreading codes, and each uplink synchronous control subchannel can be controlled any one uplink synchronous subframe that it occurs previously in the certain hour scope.
Preferable, this base station uplink synchronous control channel is multiplexed into first uplink synchronous subframe each descending sub frame afterwards in this same frame by different spreading codes.
Preferable, mobile radio station can be changed the subframe group that it takies to base station requests, and is changed by the base station.
The present invention utilizes spreading code and frame structure, one frame is distributed to a plurality of channels and user and each channel sub-frame of uplink, descending sub frame and uplink synchronous subframe are all arranged, guarantee that each user has the free time at each frame, can be at the downlink information of idle descending sub frame receiving neighbor bs, thus can carry out cell selecting, switching and gravity treatment fast.And, because a frame can be distributed to a plurality of channels and user, improved utilization to Radio Resource.
Description of drawings
The present invention will be described in detail below by drawings and Examples.
Fig. 1 is a gsm system Traffic Channel time sequential routine schematic diagram.
Fig. 2 is the frame assumption diagram of TD-SCDMA system.
Fig. 3 is the frame structure on the Radio Link among the present invention.
Fig. 4 is Traffic Channel subframe layout figure among the present invention.
Fig. 5 is many resources Traffic Channel subframe layout figure among the present invention.
Fig. 6 is uplink synchronous control channel subframe layout figure among the present invention.
Fig. 7 is Broadcast Control Channel subframe layout figure among the present invention.
Embodiment
Fig. 3 shows the frame structure of the Radio Link of the method according to this invention design.The present invention is divided into four class subframes with the frame on the Radio Link 3, is respectively sub-frame of downlink synchronization, uplink synchronous subframe, descending sub frame and sub-frame of uplink.Sub-frame of downlink synchronization is carried out down-going synchronous in order to offer mobile radio station, also can be used for the signal source of moving station measuring adjacent base station simultaneously; The effect of uplink synchronous subframe is that mobile radio station is used to carry out uplink synchronous; Descending sub frame is used to send descending signaling and business datum, and sub-frame of uplink is used to send up signaling and business datum; Signaling channel and Traffic Channel use sign indicating number branch mode to be multiplexed in the uplink and downlink subframe.In a frame, be useful on 2 sub-frame of downlink synchronization (Dssf0, Dssf1) 302,304 of down-going synchronous; 8 the uplink synchronous subframes (Ussf0, Ussf1, Ussf2, Ussf3, Ussf4, Ussf5, Ussf6, Ussf7) 312,314,316,318,320,322,324,326 that are used for uplink synchronous; 9 descending sub frames (Dsf0, Dsf1, Dsf2, Dsf3, Dsf4, Dsf5, Dsf6, Dsf7, Dsf8) 332,334,336,338,340,342,344,346,348 that are used for Downlink Control Information and business datum; 9 sub-frame of uplink (Usf0, Usf1, Usf2, Usf3, Usf4, Usf5, Usf6, Usf7, Usf8) 352,354,356,358,360,362,364,366,368 that are used for ascending control information and business datum; And the protection gap (G) 372 in when conversion between the uplink and downlink.
From Fig. 3 as seen, first subframe of each frame is a sub-frame of downlink synchronization 302, is right after 9 subframe groups 30,31,32,33,34,35,36,37,38 afterwards.Each subframe group is made of in regular turn descending sub frame, uplink synchronous subframe, sub-frame of uplink and protection gap.In subframe group 34, inserted sub-frame of downlink synchronization (Dssf1) 304 between descending sub frame (Dsf4) 340 and the uplink synchronous subframe (Ussf4) 320, be in order to allow mobile radio station in a frame, carry out down-going synchronous twice, to improve the speed of down-going synchronous.If have only a sub-frame of downlink synchronization to be fine in the frame, but reality system is when realizing, down-going synchronous can be slow.In addition, in last subframe group 38, do not have Ussf, economize on resources under the constant prerequisite of frame length guaranteeing, can adopt the design of Dsf, a Usf and a Ussf yet by adjusting.
In each subframe group, all there is a uplink synchronous subframe between descending sub frame and the sub-frame of uplink, uplink synchronous subframe 314 between for example uplink synchronous subframe 312 between descending sub frame 332 and sub-frame of uplink 352, or descending sub frame 334 and the sub-frame of uplink 354 etc.Because the subframe group is made of in regular turn descending sub frame, uplink synchronous subframe, sub-frame of uplink and protection gap; descending sub frame, uplink synchronous subframe are to occur at interval; so this frame structure also has characteristics; all there is a descending sub frame between two adjacent uplink synchronous subframes; descending sub frame 336 between for example descending sub frame between the uplink synchronous subframe 312 and 314 334, or the uplink synchronous subframe 314 and 316.
Utilize frame structure of the present invention, mobile radio station is in certain uplink synchronous subframe, as launch lock-out pulse on the uplink synchronous subframe 312 of first subframe group 30; On the descending sub frame 334 of following closely second subframe group 31, just can receive the uplink synchronous adjusted value that the base station issues; And then mobile radio station can continue to launch lock-out pulse on the uplink synchronous subframe 314 of second subframe group 31.Then, on the descending sub frame 336 of next subframe group 32, receive the uplink synchronous adjusted value.Can be implemented in two subframe groups thus and realize uplink synchronous twice.According to the frame structure of Fig. 3, mobile radio station can carry out 8 times the uplink synchronous process in a frame, and this is for setting up uplink synchronous fast and give security and helping realizing synchronous maintenance.
In the uplink synchronous process, mobile radio station is after the uplink synchronous subframe has been launched the uplink synchronous pulse, need to receive the uplink synchronous control channel of base station, when switching for assurance, mobile radio station can receive the Synchronization Control of adjacent base station, the uplink synchronous subframe of mobile radio station before its idle subframe just can be launched the uplink synchronous pulse to adjacent base station, and need not be confined to whether this uplink synchronous subframe adjacent descending and sub-frame of uplink in front and back on time domain is the shared subframe of this mobile radio station, promptly whether it communicates with current base station on these subframes.For example, the mobile radio station of busy channel a can be launched the uplink synchronous pulse to adjacent base station at uplink synchronous subframe Ussf1 (being between its Dsf1 that takies, the Usf1 subframe), also can be at Ussf2 (being on the time domain between its idle Dsf2, the Usf2 subframe) to the pulse of adjacent base station emission uplink synchronous.That is to say, utilize such frame structure, mobile radio station can any one the uplink synchronous subframe in a plurality of uplink synchronous subframes can be set up synchronously with adjacent base station to the pulse of adjacent base station emission uplink synchronous in a frame fast.
Fig. 4 shows the Traffic Channel subframe layout example of the design according to the present invention.In Fig. 4, it is multiplexing to adopt spreading code to carry out to same subframe, has constituted the physical resource by the common description of subframe, spreading code institute.The present invention has carried out the time-division again channel on the basis that sign indicating number divides, and promptly for a spreading code, all subframes in the frame are not distributed to same user.Consider factors such as transfer rate, the number of users that the maximum data rate that spreading code can carry in a frame can be supported is integer not necessarily, therefore, can give same user with the pairing physical source distributing of part subframe of a plurality of spreading codes.Just use s spreading code, support r user, wherein r, s are positive integer and r＞s 〉=1, and each subframe group of same frame is distributed to smaller or equal to r-1 mobile radio station by spreading code is multiplexing, and the subframe group of same frame is distributed to t mobile radio station (2≤t≤r) respectively.The multiplex mode of this Radio Link can guarantee that each user has some subframes in each frame be to be in idle condition; But Radio Resource is waste not, but has distributed to other users.When mobile radio station was in like this in some idle subframes, its receiver can be used for measuring the signal with receiving neighbor bs; Its transmitter then can be used to obtain the uplink synchronous of adjacent base station, even carries out access procedure; And these processes do not interrupt communicating by letter of mobile radio station and current base station.Giving different user with different sub-frame allocation, is not that all mobile radio stations that are in service condition are all transmitting in same sub-frame of uplink, and the multiple access that has also reduced up channel to a certain extent disturbs.With reference to the accompanying drawings 4, channel a has taken descending sub frame Dsf0, Dsf1, Dsf2, Dsf4, Dsf5, the Dsf6 of spreading code i, sub-frame of uplink Usf0, Usf1, Usf2, Usf4, Usf5, Usf6; Channel b has taken descending sub frame Dsf2, Dsf3, Dsf4, Dsf6, Dsf7, the Dsf8 of spreading code j, sub-frame of uplink Usf2, Usf3, Usf4, Usf6, Usf7, Usf8; Channel c has taken descending sub frame Dsf3, Dsf7, the Dsf8 of spreading code i, descending sub frame Dsf0, the Dsf1 of spreading code j, Dsf5, sub-frame of uplink Usf3, the Usf7 of spreading code i, Usf8, sub-frame of uplink Usf0, the Usf1 of spreading code j, Usf5.As seen, utilize spreading code, two frames can be distributed to three channels, channel a, channel b, channel c.During allocated channel, each subframe in the same frame of same spreading code is distributed to plural channel respectively.
Because each channel is supported a user, then the arranged mode of Fig. 4 makes 2 spreading codes support 3 users, and each mobile radio station all has at least 1/3 subframe to be in idle condition in each frame, for example, be operated in the mobile radio station on the channel a, the subframe that takies at channel c is in idle condition, is in idle condition at descending sub frame Dsf3, Dsf7, Dsf8 and sub-frame of uplink Usf3, Usf7, Usf8; Then this mobile radio station can utilize these subframes, uses same transceiver adjacent base station is measured even to be communicated by letter, and can not cause the communication disruption with original base station.Be operated in the mobile radio station on the channel c, be in idle condition at descending sub frame Dsf2, Dsf4, Dsf6 and sub-frame of uplink Usf2, Usf4, Usf6.Equally, be operated in the mobile radio station on the channel b, in descending sub frame Dsf0, Dsf1, Dsf5 and sub-frame of uplink Usf0, Usf1, Usf5 free time.
In conjunction with Fig. 3 and Fig. 4, for example, be operated in mobile radio station arbitrary uplink synchronous subframe emission lock-out pulse in the uplink synchronous subframe 312,314,316 of its first, second and third subframe group 30,31,32 that takies of channel a; On the descending sub frame 338 of the 4th the subframe group 33 of its free time, just can receive the uplink synchronous adjusted value that adjacent base station issues; And then mobile radio station can continue to launch lock-out pulse on the uplink synchronous subframe 318 of the 4th subframe group 33.Then, on the descending sub frame 340 of the subframe group 34 of the channel a that next mobile radio station takies, receive the uplink synchronous adjusted value.In addition, the mobile radio station that is operated in channel a also can be launched lock-out pulses in the uplink synchronous subframe 318 of its idle subframe group 33; At descending sub frame 346, the 348 receiving neighbor bs uplink synchronous adjusted values of its idle subframe group 37,38 subsequently.Therefore, be operated in the mobile radio station of a certain channel, can be at any uplink synchronous subframe emission lock-out pulse of a frame, but can only be at the descending sub frame receiving neighbor bs uplink synchronous adjusted value of its idle channel, realize uplink synchronous with adjacent base station, even carry out access procedure, but do not influence and the communicating by letter of current base station.Subframe group the subframe group that takies except that himself is the idle subframe group of mobile radio station.
Same channel takies subframe in a frame a kind of pattern is called as a kind of subframe and takies pattern.Each subframe takies all unique correspondence of pattern and a kind of subframe idle pulley.Subframe group except that the subframe group that certain channel or mobile radio station take is the idle subframe group of this channel or mobile radio station, and the subframe idle pulley is exactly the time domain arrangement mode of the idle subframe group of certain channel in a frame.For example, certain channel occupancy all even number subframe groups, then corresponding work in the mobile radio station of this channel in all odd number subframe group free time.Among Fig. 4, the mobile radio station of busy channel a has taken (spreading code i) descending sub frame Dsf0, Dsf1, Dsf2, Dsf4, Dsf5, Dsf6, sub-frame of uplink Usf0, Usf1, Usf2, Usf4, Usf5, Usf6; The mobile radio station of busy channel b has taken (spreading code j) descending sub frame Dsf2, Dsf3, Dsf4, Dsf6, Dsf7, Dsf8, sub-frame of uplink Usf2, Usf3, Usf4, Usf6, Usf7, Usf8; The mobile radio station of busy channel c has taken (spreading code i) sub-frame of uplink Usf3, Usf7, Usf8, descending sub frame Dsf3, Dsf7, Dsf8, (spreading code j) descending sub frame Dsf0, Dsf1, Dsf5, sub-frame of uplink Usf0, Usf1, Usf5.This is respectively that 3 kinds of subframes take pattern, and to 3 kinds of subframe idle pulleys should be arranged, that is, the mobile radio station of busy channel a is at (spreading code i) sub-frame of uplink Usf3, Usf7, Usf8, descending sub frame Dsf3, Dsf7, Dsf8 free time, its idle subframe group 33,37,38; The mobile radio station of busy channel b is at (spreading code j) descending sub frame Dsf0, Dsf1, Dsf5, sub-frame of uplink Usf0, Usf1, Usf5 free time, its idle subframe group 30,31,35; The mobile radio station of busy channel c is at descending sub frame Dsf2, Dsf4, Dsf6, sub-frame of uplink Usf2, Usf4, Usf6 free time, its idle subframe group 32,34,36.
Be appreciated that this multiplex mode can also be in the situation of using a spreading code (s=1), distributes to a channel with preceding 5 in 9 subframe groups in the frame; And give one other channel with back 4 subframe set of dispense.Perhaps, give a channel with strange subframe set of dispense; Give one other channel with even subframe set of dispense.
Above-mentioned said multiplex mode is the user at basic service, for example half-rate speech business.If the user wishes to carry out other higher business of data transfer rate, just need be for the user distribute more spreading code or sub-frame resources, this type of user is called as many resource users.The present invention requires to distribute more spreading code for many resource users, and to use same kind of subframe to take pattern, be about to same subframe and the same channel of a plurality of frequency spreading code division dispensings that takies pattern, and give many resource users with this channel allocation, to guarantee that mobile radio station all has some subframes to be in idle condition at every frame.
Fig. 5 has provided the subframe layout example that mobile radio station uses the Traffic Channel that many resource users and base station communicate.Wherein carried 5 channels altogether by 4 spreading code i, j, the multiplexing radio frames #u of k, l respectively, channel a, channel b, channel c, channel d, channel e, wherein, channel a is many channel resources.In order to guarantee that mobile radio station is in many channel resources, its subframe idle pulley is constant, subframe under the same kind of subframe occupancy of a plurality of spreading codes to be given same channel when distributing many resources for channel a, as Fig. 5, multiplexing subframe Dsf0, Dsf1, Dsf2, Dsf4, Dsf5, Dsf6, Usf0, Usf1, Usf2, Usf4, Usf5, the Usf6 of spreading code i, k distributes to channel a, to satisfy the demand of channel a to resource.
In handoff procedure, some system needs mobile radio station to read the information of some down channel of target BS, for example Broadcast Control Channel (BCCH) before switching is finished.Needing the system of uplink synchronous, need read the uplink synchronous control channel (USCCH) of target BS, so that obtain the uplink synchronous adjusted value.
For guarantee mobile radio station can do not interrupt with situation that current base station is communicated by letter under these channels of receiving neighbor bs, aforesaid Broadcast Control Channel, these channels should send according to the subframe idle pulley of mobile radio station, that is, the base station uses those subframes of mobile radio station idle channel to broadcast it to be used to the broadcast message switching or insert.But the subframe of a mobile radio station free time is the subframe that takies of another one mobile radio station just, and the base station can't guarantee that the mobile radio station of its down channel in can all switch by neighbor cell simultaneously receive.Therefore, the base station should be repeated this downlink information to send with each mobile radio station subframe idle pulley.For example, the base station need send p bar broadcast on Broadcast Control Channel, and total r mobile radio station is provided with q kind mobile radio station subframe idle pulley, and then the base station need with each bar message with each emission of q kind pattern once promptly constitute the emission cycle of a p * q frame length.For broadcast, do the decline that can't cause systematic function like this, because broadcast originally also repeats to send on Broadcast Control Channel, shared subframe when the present invention has just changed its emission.In addition, r and q not necessarily equate, a plurality of channels or mobile radio station can shared a kind of subframe idle pulley or subframe take pattern.
In order to make mobile radio station know what pattern send channel the base station adopts at which frame, can using system frame number (SFN).Usually each frame all has a System Frame Number, every emission one frame, and this numerical value increases by 1.SFN circulated in a bigger cycle, made zero when numerical value reaches the maximum of system design.Like this, SFN can be calculated divided by the remainder after p * q in the base station, adopts fixing mobile radio station subframe idle pulley transmitting channel on the p * stationary phase of q in the frame period.Therefore, as long as mobile radio station is known the System Frame Number of adjacent base station, just can be in the correct intactly Broadcast Control Channel of receiving neighbor bs of its idle subframe.
With Fig. 6 is example, and USCCH is used for sending uplink synchronous to mobile radio station and postpones adjusted value, carries out uplink synchronous with the auxiliary moving station.In this example, USCCH and other downlink business or signaling channel to descending sub frame, for example use spreading code y by code division multiplexing.USCCH has been divided into 8 independent subchannel USCCH0, USCCH1, USCCH2, USCCH3, USCCH4, USCCH5, USCCH6, USCCH7, to the uplink synchronous pulsing synchronization delay control information that its front adjacent uplink synchronous subframe Ussf0312, Ussf1314, Ussf2316, Ussf3318, Ussf4320, Ussf5322, Ussf6324, Ussf7326 receive, each USCCH subchannel also can be controlled any one Ussf that it occurs previously in the certain hour scope.Because mobile radio station idle subframe can receiving neighbor bs information, then mobile radio station can that uplink synchronous subframe before certain idle subframe be launched lock-out pulse to adjacent base station at it, and at the USCCH signal of this free time descending sub frame receiving neighbor bs.For example, work in the mobile radio station of channel a, can launch lock-out pulse to adjacent base station, and receive the uplink synchronous control channel USCCH2 of these base stations at Dsf3 338 at Ussf2 316.
Fig. 7 shows Broadcast Control Channel (BCCH) the subframe layout example of the design according to the present invention.Some system requirements mobile radio station read the information of some channel of base station, for example Broadcast Control Channel before switching is finished.In order to make full use of the idle subframe of mobile radio station, the base station should repeat information to send on each subframe idle pulley in broadcasting.For example, broadcast one group of informational needs p frame, have 3 kinds of subframe idle pulleys, then the base station need be with this group information repeated broadcast in the 3p frame.See Fig. 7, the base station uses aforementioned 3 kinds of subframe idle pulleys that length is carried out 3 broadcasting as the broadcast message of p frame respectively on Broadcast Control Channel, receives so that be operated in the mobile radio station of different subframe idle pulleys.Particularly, the base station is with same spreading code m, and at first group of p frame (#w+1 is to the #k+p frame), with the first subframe idle pulley broadcasting of channel a correspondence, emission BCCH promptly, broadcasts on the idle subframe group 33,37,38 of channel a free time; At second group of p frame (#w+p+1 is to the #k+2p frame), with the second subframe idle pulley broadcasting of channel b correspondence, emission BCCH promptly, broadcasts on the idle subframe group 30,31,35 that channel c takies in the channel b free time; At the 3rd group of p frame (#w+2p+1 is to the #k+3p frame), with the 3rd subframe idle pulley broadcasting of channel c correspondence, emission BCCH, that is, and broadcasting on idle subframe group 32,34,36.
In order to make mobile radio station know what pattern send channel the base station adopts at which frame, can using system frame number (SFN).Usually each frame all has a System Frame Number, every emission one frame, and this numerical value increases by 1.SFN circulated in a bigger cycle, made zero when numerical value reaches the maximum of system design.With reference to figure 7, SFN can be calculated divided by the remainder after the 3p in the base station, adopts fixing mobile radio station subframe idle pulley transmitting channel on the stationary phase of 3p in the frame period.If remainder is at first group of p frame, then first subframe idle pulley emission BCCH is adopted in the base station; If remainder is at second group of p frame, then second subframe idle pulley emission BCCH is adopted in the base station; If remainder is at the 3rd group of p frame, then the 3rd subframe idle pulley emission BCCH is adopted in the base station.Therefore, as long as mobile radio station is known the System Frame Number of adjacent base station, just can be in the correct intactly Broadcast Control Channel of receiving neighbor bs of its idle subframe.
Same kind of subframe idle pulley emission BCCH not necessarily will be adopted at same System Frame Number (SFN) in each base station; And independently SFN may be adopted in each base station, the SFN difference of each base station of synchronization.Therefore can realize that adjacent base station adopts different subframe idle pulley emission BCCH.Promptly at Fig. 7, at synchronization, the System Frame Number value difference of adjacent base station can be first group, second group or the 3rd group of p frame, and so, different subframe idle pulleys can be adopted in each base station in 3 kinds of subframe idle pulleys.This just means that mobile radio station can receive the BCCH of a plurality of adjacent base stations in the different subframes of same frame in same frame; And need in a frame, not accept the BCCH of certain base station, wait until that again next frame receives the BCCH of another one base station.The adjacent base station synchronization adopts subframe emission broadcast message or other information of non-overlapping copies, make mobile radio station in cell selecting, sub-district gravity treatment or handoff procedure, can completely receive broadcast message or other information of a plurality of adjacent base stations in the different subframes of same frame.Therefore, based on frame structure and its corresponding BCCH broadcast mode of the present invention design, mobile radio station equally can fast demodulation goes out the broadcast singal of a plurality of adjacent base stations, has improved mobile radio station and has carried out the speed that cell selecting, sub-district gravity treatment, sub-district are switched.
Mobile radio station can adopt different subframes to take pattern and the base station communicates at different frames, and the subframe idle pulley that mobile radio station adopted is judged according to System Frame Number in the base station.When mobile radio station takies pattern in the change subframe, should change its subframe to base station requests and take pattern, change its subframe by the base station according to the request of mobile radio station and take pattern.
Though above described the present invention by embodiment, those of ordinary skills know, the present invention has many distortion and variation and does not break away from spirit of the present invention, appended claim will comprise these distortion and variation.
Claims (12)
1. the Radio Link multiplexing method of a TDD CDMA mobile communication system, this communication system has at least two base stations and a plurality of mobile radio station, and each mobile radio station utilizes channel and base station communication, it is characterized in that:
Different subframe group (30,31 at least two same spreading codes of the same frame of channel occupancy ... 38), wherein, each subframe group is made of at interval in regular turn a descending sub frame, a uplink synchronous subframe, a sub-frame of uplink and a protection;
This mobile radio station that is assigned to this channel transmits in the sub-frame of uplink and the uplink synchronous subframe of the subframe group that takies separately, receives the signal of present base station at the descending sub frame of the subframe group that takies separately,
This mobile radio station receives from adjacent signal of base station at the descending sub frame of the idle subframe group of same frame, and wherein, the subframe group the subframe group that takies except that himself is the idle subframe group of this mobile radio station.
2. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 1 is characterized in that:
S spreading code to same frame carries out multiplexing r the mobile radio station of distributing to, and wherein r, s are positive integer and r＞s 〉=1;
Each subframe group of same frame is distributed to smaller or equal to r-1 mobile radio station by spreading code is multiplexing;
The subframe group of same frame is distributed to t mobile radio station, wherein 2≤t≤r respectively.
3. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 2 is characterized in that:
The resource of a plurality of spreading codes of the same frame of same channel occupancy, and under each spreading code, the subframe group of the same frame that it takies is identical.
4. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 2 is characterized in that:
A plurality of channels use identical subframe idle pulley.
5. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 2 is characterized in that:
The base station is a cycle repeated broadcast broadcast message with the q frame, and in different frame, broadcast at the subframe idle pulley of different channels the base station, and each frame is also only broadcasted at the subframe idle pulley of a channel, wherein, q is the subframe idle pulley kind that the base station is selected for use.
6. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 5 is characterized in that:
Per 2 spreading codes to same frame carry out multiplexing 3 mobile radio stations of distributing to, the base station is the cycle repeated broadcast with 3 frames, wherein first frame is broadcasted in the idle subframe group (33,37,38) of a mobile radio station, second frame is broadcasted in the idle subframe group (30,31,35) of another mobile radio station, and the 3rd frame in the end idle subframe group (32,34,36) of a mobile radio station is broadcasted.
7. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 5 is characterized in that:
The base station according to System Frame Number divided by the remainder after p * q, cycle repeated broadcast information on inherent Broadcast Control Channel of p * q frame period, wherein p is the number of the shared frame of broadcast message.
8. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 7 is characterized in that:
The subframe emission information of non-overlapping copies is adopted in adjacent base station at synchronization.
9. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 1 is characterized in that:
The subframe group that has two or more intervals of a same frame of channel occupancy in two channels at least.
10. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 1 is characterized in that:
Base station uplink synchronous control channel is divided into most subchannels, and each subchannel is multiplexed into a descending sub frame by different spreading codes, and each uplink synchronous control subchannel is controlled any one uplink synchronous subframe that it occurs previously in the certain hour scope.
11. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 10 is characterized in that:
Base station uplink synchronous control channel is multiplexed into first uplink synchronous subframe each descending sub frame afterwards in this same frame by different spreading codes.
12. the Radio Link multiplexing method of TDD CDMA mobile communication system as claimed in claim 1 is characterized in that:
Mobile radio station is changed the subframe group that it takies to base station requests, and is changed by the base station.
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| GB2431073B (en) * | 2005-10-10 | 2008-05-14 | Ipwireless Inc | Cellular communication system and method for co-existence of dissimilar systems |
| US8599799B2 (en) * | 2006-05-18 | 2013-12-03 | Qualcomm Incorporated | Method of improving throughput in a system including persistent assignments |
| CN101282568B (en) * | 2007-04-03 | 2012-10-10 | 中兴通讯股份有限公司 | System capable of combination support of a plurality of multiple accesses |
| CN101374018B (en) * | 2007-08-23 | 2012-11-28 | 中兴通讯股份有限公司 | Self-adapting method for distributing physical resource blocks base on OFDM system |
| CN101483476B (en) * | 2008-01-07 | 2012-06-27 | 华为技术有限公司 | Sleeping method for differentiating uplink and downlink sub-frames |
| CN101645751B (en) * | 2008-08-05 | 2012-10-03 | 华为技术有限公司 | Method, system and device for transmitting downlink associated control channel frames |
| EP2728786A1 (en) * | 2012-11-05 | 2014-05-07 | Alcatel Lucent | Apparatuses, methods, and computer programs for a receiver and a transmitter of a wireless system |
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| JP2000115027A (en) * | 1998-08-07 | 2000-04-21 | Sekisui Chem Co Ltd | Spread spectrum communication method and device therefor |
| WO2001067620A2 (en) * | 2000-03-10 | 2001-09-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Uplink synchronization signal transmission in tdd systems |
| WO2001072080A1 (en) * | 2000-03-23 | 2001-09-27 | Siemens Information And Communication Networks S.P.A. | Access channel scheduling in a radio communication system |
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| CN1182990A (en) * | 1997-10-05 | 1998-05-27 | 北京信威通信技术有限公司 | Method for establishing and holding synchronous code division multiple access communication chain |
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