CN1665334A - Method for assigning carrier frequency and timeslot in time division duplexing - CDMA system - Google Patents
Method for assigning carrier frequency and timeslot in time division duplexing - CDMA system Download PDFInfo
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- CN1665334A CN1665334A CN 200510064800 CN200510064800A CN1665334A CN 1665334 A CN1665334 A CN 1665334A CN 200510064800 CN200510064800 CN 200510064800 CN 200510064800 A CN200510064800 A CN 200510064800A CN 1665334 A CN1665334 A CN 1665334A
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Abstract
The invention discloses a method for allocating carrier frequency and time gap in time-division diplexing-code division multiple access system, where the said system comprises many cells and the said method includes the steps: (1) dividing each cell into many subcells, and arranging an antenna array in each subcell; (2) the uplink and downlink carrier frequency and time gap are unrepeatedly allocated to each subcell; (3) as a user accesses to the subcell, the base station allocates the carrier frequency and time gap to the user from the subcell the user is situated; (4) as the subcell the user is situated has no enough carrier frequency and time gap to the user, the base station borrows the carrier frequency and time gap from other subcell to the user; (5) as the subcell has idle carrier frequency and time gap, the base station allocates them to the user.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communication technology field.Specifically, relate to method for channel allocation based on time division duplexing-CDMA (TDD-CDMA) system of general distribution antenna battle array.
Background technology
In the TDD-CDMA system of traditional centralized single antenna battle array, in each time slot of each sub-district, base station (Node B) antenna all sends simultaneously for all users' signal, arrive the receiver of each travelling carriage (MT) through same channel, therefore they all arrive each MT simultaneously, the main footpath of signal also keeps synchronously, orthogonality between the descending code word of same like this time slot only can be brought very little loss because of the interference between multipath, can not have the loss of the non-orthogonal orthogonality of bringing between the code word that the dislocation in main footpath causes, thereby the performance of joint-detection can not worsen.Equally, at up channel, make all signal Synchronization of same ascending time slot arrive the receiver of Node B at the MT transmitter by timing advance, the combined detection performance of upward signal can not worsen yet.
Existing general distribution antenna battle array is divided into the experimental process sub-district with each conventional cell, each sub cell adopts one and independently brings in covering before the RF of antenna array as Node B, each user only carries out being connected of wireless signal with the antenna array of place sub cell, just from logic each conventional cell being split into a plurality of littler sub-districts, but the public cover base station equipment of these logic district, comprise band processing system, each antenna array just as the RF front end of Node B, is connected to Node B by optical fiber or microwave.In the TDD-CDMA system, by introducing the general distribution antenna battle array, can reduce the transmitting power of system, reduce interference to adjacent sub-district, improve the performance of switching, strengthen covering.
Yet, in existing TDD-CDMA system based on the general distribution antenna battle array, owing to the antenna array that has a plurality of synchronized transmissions in the sub-district, if the user in the same descending time slot adheres to different sub cells separately, because each MT is different to the distance of each antenna array, the transmission time difference of signal demand from each antenna array to this MT, cause the signal on the different code words can not arrive this MT synchronously, thereby the orthogonality between the spread spectrum code word can be destroyed, and then worsens the performance of joint-detection.In ascending time slot, also there is same problem, though the user can control the benchmark time of advent that antenna array that (timing advance) be synchronized to Node B requires by uplink synchronous, but because same MT is different apart from the distance of each antenna array, the transmission signal of MT can not arrive each antenna array simultaneously synchronously, if the different MT of same ascending time slot adhere to different sub cells separately, interference in the sub-district and signal can not arrive the receiving terminal of antenna array synchronously, orthogonality between the spread spectrum code word will be subjected to certain loss, thereby cause the performance loss of joint-detection, this mis-behave may be up to more than the 3dB.This brings difficulty in the application of TDD-CDMA can for the general distribution antenna battle array.
As shown in Figure 4, MT2 is positioned at the sub cell that antenna array 1 covers, and it is respectively T2 and T1 to the propagation delay time of antenna array 1 and antenna array 2.MT1 then is positioned at the sub cell that antenna array 2 covers, and it is respectively T3 and T4 to the propagation delay time of antenna array 2 and antenna array 1.Usually MT2 sets up with antenna array 1 and communicates by letter, and the upward signal of MT2 is synchronized to antenna array 1 so.MT1 sets up with antenna array 2 and communicates by letter, and the upward signal of MT1 is synchronized to antenna array 2, because MT2 is different to the distance of antenna array 1 and antenna array 2, so T3 is different with T4, the upward signal of MT2 can not arrive antenna array 2 synchronously with the upward signal of MT1.Equally, the upward signal of MT1 can not arrive antenna array 1 synchronously with the upward signal of MT2.If the upward signal of MT1 and MT2 is shared the same time slot of same carrier frequency, their orthogonalities on antenna array 1 and antenna array 2 can be because aforesaid asynchronous and incur loss so, thereby worsen the performance of combined detector.Have the situation of similar up channel equally at down channel, the performance of detector can be because worsen with the loss of the orthogonality of time slot signal.
Summary of the invention
Can strengthen the power system capacity and the covering of TDD-CDMA system in view of existing general distribution antenna battle array, also may worsen simultaneously the performance of the joint-detection of up-downgoing channel, purpose of the present invention just provides a kind of dynamic channel assignment method of the TDD cdma system based on the general distribution antenna battle array.
The invention discloses a kind of carrier frequency and time slot method of distributing in time division duplexing-CDMA system, described time division duplexing-CDMA system comprises a plurality of sub-districts, and described method comprises step:
(1) each microzonation is divided into a plurality of sub cells, an antenna array is set respectively in each sub cell;
(2) up-downgoing carrier frequency and the time slot with described time division duplexing-CDMA system repeatedly do not distribute each sub cell respectively;
(3) when the user inserts sub cell, the base station is distributed carrier frequency and time slot from the sub cell that described user was positioned to described user;
(4) when the sub cell that described user was positioned at does not have enough carrier frequency and time slot allocation to give described user, use carrier frequency and time slot from other sub cells, to distribute to described user;
When (5) idle carrier frequency and time slot occurring, distribute the carrier frequency and the time slot of its sub cell that is arranged in for described user in the sub-district that described user was positioned at.
According to basic design of the present invention, Node B is given different logical sub sub-districts with different carrier frequency with time slot allocation, preferential carrier frequency and the time slot that belongs to this sub cell that use of MT that belongs to certain sub cell, if inadequate resource, use from other sub cells again, if the resource of this sub cell occurs idle, then switch back the carrier frequency and the time slot of this sub cell.
According to technical scheme of the present invention, between the sub cell by the covering of the different distributions linear (antenna) array in same base station, carry out the distribution of rational carrier frequency and time slot, reduce or eliminate because the loss of the orthogonality between the code word that asynchronous arrival brought of transmitting of co-frequency co-time slot, thereby reduce the mis-behave of joint-detection, reduce or eliminate interference between the spaced antenna battle array in the same base station, improve the capacity of whole system.
Description of drawings
Fig. 1 shows the frame structure of the TD-SCDMA system of the present invention's application;
Fig. 2 shows traditional single antenna battle array cell structure schematic diagram;
Fig. 3 shows the cell structure schematic diagram of the many antenna arrays of general distribution of the present invention's application;
Fig. 4 example in the many antenna arrays of existing general distribution, the signal that a plurality of users that belong to different sub cells exist when sharing same time slot is asynchronous.
Embodiment
Below in conjunction with accompanying drawing and concrete exemplifying embodiment the present invention is remake further detailed explanation.
According to a preferred embodiment of the invention, carrier frequency and the time slot method of distributing in time division duplexing-CDMA system of the present invention comprises some steps:
(1) each microzonation that time division duplexing-CDMA system of the present invention comprised is divided into a plurality of sub cells, and an antenna array is set respectively in each sub cell.For example, be a logical sub sub-district with the approximate zone definitions that covers of each antenna array in each sub-district.
(2) up-downgoing carrier frequency and the time slot with described time division duplexing-CDMA system repeatedly do not distribute each sub cell respectively.In this step, distribute carrier frequency and time slot according to the quantity of sub cell, and the quantity at carrier frequency and time slot can not by a time slot of the shared carrier frequency of two adjacent sub cells, be avoided a plurality of sub cells to share a time slot by the whole timesharing of these sub cells as far as possible.
(3) when the user inserts sub cell, the base station is distributed carrier frequency and time slot from the sub cell that described user was positioned to described user.
In general, when being user's allocated channel, carrier frequency that preferential as far as possible use exclusively enjoys and the sign indicating number channel in the time slot.Have only the sign indicating number channel that when the resource exhaustion that exclusively enjoys, just distributes in shared carrier frequency and the time slot, perhaps use carrier frequency, time slot and sign indicating number channel from adjacent sub cell.
According to the present invention, when new user inserted, Radio Resource preferentially distributed from the sub cell at new user place.Distribute carrier frequency, time slot and sign indicating number channel like this, not the signal that can guarantee the different user in the different sub cells not overlapping on time-domain, the user who guarantees each sub cell can not guarantee that to greatest extent the performance of joint-detection can not worsen because of the loss of orthogonality to produce the interference in the sub-district with the user in other sub cells of sub-district.
(4) when the sub cell that described user was positioned at does not have enough carrier frequency and time slot allocation to give described user, use carrier frequency and time slot from other sub cells, to distribute to described user.Specifically, if the sub cell at place does not have enough resources, then from the carrier frequency of other sub cells and time slot, use.The principle of using is to use resource from resource consumption minimum or idle carrier frequency and time slot.
In the present invention, carrier frequency of being used and time slot can be carrier frequency and the time slots of being shared by described user and adjacent sub cell, also can be carrier frequency and the time slots that is exclusively enjoyed by other sub cells.
When (5) idle carrier frequency and time slot occurring, distribute the carrier frequency and the time slot of its sub cell that is arranged in for described user in the sub-district that described user was positioned at.
In the present invention, if use generation, in case enough idling-resources appear in carrier frequency of this sub cell and time slot, then be that the user who uses the resource of other sub cells redistributes carrier frequency of this sub cell and the sign indicating number channel in the time slot, use time slot or code channel idle in this sub cell instead.Resources allocation can guarantee that the interference in the sub-district that the subscriber signal between sub cell produces only has influence on minimum user like this.
Below in conjunction with accompanying drawing 1 a preferred embodiment of the present invention is described.
Suppose that there is the 5MHz bandwidth in an operator, can support 3 TD-SCDMA carrier frequency.The structure of time slot of TD-SCDMA system, as shown in Figure 1, for common symmetrical structure of time slot, the timeslot number that 6 business time-slots are defined as TS1～TS6 up-downgoing is respectively 3, and TS1, TS2, TS3 be as up, and TS4, TS5, TS6 are as descending time slot; Each time slot has 16 spread spectrum code words; The consisting of of channel (carrier frequency, time slot, spread spectrum code word) in the system.Customer service in the supposing the system is the EFS speech business of 12.2Kbps, then each user need be in 2 spread spectrum code words of the time slot of each carrier frequency of uplink and downlink link consumption, that is to say that a channel is made up of (1 carrier frequency, 1 time slot, 2 spread spectrum code words).The method according to this invention distributes a time slot respectively for each sub cell, and then the channel resource of each sub cell distributes as shown in table 1 in the sub-district.
The time slot allocation of 3 carrier wave TD-SCDMA systems of table 1 general distribution antenna battle array
| Carrier frequency | Carrier frequency 1 | Carrier frequency 2 | Carrier frequency 3 | Every sub cell total channel number | ||||
| Link direction | Up | Descending | Up | Descending | Up | Descending | Up | Descending |
| Sub cell A | ??TS1 | ??TS4 | ??TS1 | ??TS4 | ??TS1 | ??TS4 | ????24 | ????24 |
| Sub cell B | ??TS2 | ??TS5 | ??TS2 | ??TS5 | ??TS2 | ??TS5 | ????24 | ????24 |
| Sub cell C | ??TS3 | ??TS6 | ??TS3 | ??TS6 | ??TS3 | ??TS6 | ????24 | ????24 |
Because the user in each sub cell only needs to communicate by letter with the antenna array of this sub cell, the downstream signal of all users in each sub cell still keeps arriving synchronously each MT, upward signal then can be as traditional TD-SCDMA system, by the uplink synchronous operation, make upward signal arrive the antenna array of sub cell (synchronous error is 1/8th chip period) synchronously.Like this, both guaranteed that the performance of joint-detection was not suffered a loss, and made the signal between adjacent sub cell not have the phase mutual interference again simultaneously.When the user in each sub cell during skewness, can keep above time slot allocation method, just when the channel of sub cell is not enough, just the channel of using from other little sub cell of load inserts new user, so only can have influence on the performance of the user in the time slot, and can not influence the interior user's of all time slots of whole sub-district performance.The Radio Resource of sub cell of finding to use the user place of channel when Node B occurs idle, the user that then will use channel switches to from the channel of using on the idle channel of this sub cell, so just can avoid the loss of the combined detection performance that brings of influencing each other of the signal between sub cell.
Fig. 2 is 3 single antenna battle array sub-district schematic diagrames of the prior art, and each 8 yuan of even linear array covers a hexagonal sub-district, and antenna array is positioned at the central authorities of sub-district, and each antenna array is connected with separately Node B.
Fig. 3 is the schematic diagram according to the broad sense sub-district of 3 distributed 8 yuan of even linear arrays of employing of the present invention.Hexagonal sub cell of the approximate covering of each spaced antenna battle array, antenna array is positioned at the central authorities of sub cell; And all spaced antenna battle arrays all are connected to common Node B, are finished the base band signal process and the controlled function of whole sub-district by Node B.According to technical scheme of the present invention, between the sub cell by the covering of the different distributions linear (antenna) array in same base station, carry out the distribution of rational carrier frequency and time slot, reduce or eliminate because the loss of the orthogonality between the code word that asynchronous arrival brought of transmitting of co-frequency co-time slot, thereby reduce the mis-behave of joint-detection, reduce or eliminate interference between the spaced antenna battle array in the same base station, improve the capacity of whole system.
Claims (4)
1. one kind is distributed carrier frequency and time slot method in time division duplexing-CDMA system, and described time division duplexing-CDMA system comprises a plurality of sub-districts, and described method comprises step:
(1) each microzonation is divided into a plurality of sub cells, an antenna array is set respectively in each sub cell;
(2) up-downgoing carrier frequency and the time slot with described time division duplexing-CDMA system repeatedly do not distribute each sub cell respectively;
(3) when the user inserts sub cell, the base station is distributed carrier frequency and time slot from the sub cell that described user was positioned to described user;
(4) when the sub cell that described user was positioned at does not have enough carrier frequency and time slot allocation to give described user, use carrier frequency and time slot from other sub cells, to distribute to described user;
When (5) idle carrier frequency and time slot occurring, distribute the carrier frequency and the time slot of its sub cell that is arranged in for described user in the sub-district that described user was positioned at.
2, method according to claim 1, wherein step (2) also comprises step:
Distribute carrier frequency and time slot according to the quantity of sub cell,
Quantity at carrier frequency and time slot can not be shared a time slot of a carrier frequency by the whole timesharing of these sub cells by two adjacent sub cells.
3, method according to claim 2, wherein carrier frequency of using in step (4) and time slot are carrier frequency and the time slots of being shared by described user and adjacent sub cell.
4, method according to claim 2, wherein carrier frequency of using in step (4) and time slot are carrier frequency and the time slots that is exclusively enjoyed by other sub cells.
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| CNB2005100648000A CN100409714C (en) | 2005-04-22 | 2005-04-22 | Method for assigning carrier frequency and timeslot in time division duplexing - CDMA system |
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| CNB2005100648000A CN100409714C (en) | 2005-04-22 | 2005-04-22 | Method for assigning carrier frequency and timeslot in time division duplexing - CDMA system |
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| CN1665334A true CN1665334A (en) | 2005-09-07 |
| CN100409714C CN100409714C (en) | 2008-08-06 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103260167A (en) * | 2013-04-19 | 2013-08-21 | 大唐移动通信设备有限公司 | Method and system for lowering cell interference |
| CN103841643A (en) * | 2012-11-27 | 2014-06-04 | 华为技术有限公司 | Data transmitting method, device and system |
| WO2017028060A1 (en) * | 2015-08-14 | 2017-02-23 | 华为技术有限公司 | Method, device and apparatus for accessing a multiple-antenna system |
| WO2018120083A1 (en) * | 2016-12-30 | 2018-07-05 | Panasonic Intellectual Property Corporation Of America | Wireless communication method, apparatus and system |
| CN108260101A (en) * | 2016-12-27 | 2018-07-06 | 宏碁股份有限公司 | The method and communication device of dynamic allocation of resources |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60040936D1 (en) * | 2000-03-20 | 2009-01-08 | Mitsubishi Electric Inf Tech | A base station for transmitting a word representative of the spreading codes allocated to the mobile stations in communication with the base station, respectively |
| CN1176563C (en) * | 2001-01-18 | 2004-11-17 | 华为技术有限公司 | Dynamic channel allocating method |
| CN1369978A (en) * | 2001-02-15 | 2002-09-18 | 深圳市中兴通讯股份有限公司 | Method for distributing calling resource of CDMA base station system |
| US6591109B2 (en) * | 2001-08-17 | 2003-07-08 | Interdigital Technology Corporation | Cross cell user equipment interference reduction in a time division duplex communication system using code division multiple access |
| CN1564483A (en) * | 2004-04-07 | 2005-01-12 | 中兴通讯股份有限公司 | Dynamic channel distributing method of TD-SCDMA |
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2005
- 2005-04-22 CN CNB2005100648000A patent/CN100409714C/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103841643A (en) * | 2012-11-27 | 2014-06-04 | 华为技术有限公司 | Data transmitting method, device and system |
| CN103841643B (en) * | 2012-11-27 | 2017-12-05 | 华为技术有限公司 | Data transmission method and device, system |
| CN103260167A (en) * | 2013-04-19 | 2013-08-21 | 大唐移动通信设备有限公司 | Method and system for lowering cell interference |
| WO2017028060A1 (en) * | 2015-08-14 | 2017-02-23 | 华为技术有限公司 | Method, device and apparatus for accessing a multiple-antenna system |
| CN108260101A (en) * | 2016-12-27 | 2018-07-06 | 宏碁股份有限公司 | The method and communication device of dynamic allocation of resources |
| WO2018120083A1 (en) * | 2016-12-30 | 2018-07-05 | Panasonic Intellectual Property Corporation Of America | Wireless communication method, apparatus and system |
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Effective date of registration: 20060217 Address after: 100876 Beijing city Haidian District Xitucheng Road No. 10 Applicant after: Beijing University of Posts and Telecommunications Co-applicant after: Spreadtrum Communications (Shanghai) Co., Ltd. Address before: 100876 Beijing city Haidian District Xitucheng Road No. 10 Applicant before: Beijing University of Posts and Telecommunications |
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