CN1784068A - Method for reducing interference between small zones in time-division synchronous CDMA cut-in system - Google Patents
Method for reducing interference between small zones in time-division synchronous CDMA cut-in system Download PDFInfo
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Abstract
This invention relates to a method for reducing reference among cells in TD-SCDMA access system. It contains respectively distributing different number up and down service time slot to different cells according to different service types, in adjacent cells with different service time slot, stopping any cell to use said service time slot and keeping another cell up and down service time slot to be unchanged. Said invention can optimize TD-SCDMA access system configuration and raise system capacity.
Description
(1) technical field
The present invention relates to reduce in a kind of wireless communication system the method for disturbing, more specifically to the method that reduces presence of intercell interference in a kind of time-division-synchronous CDMA access system.
(2) background technology
It is one of 3-G (Generation Three mobile communication system) standard that Time Division-Synchronous Code Division Multiple Access inserts (Time Division-Synchronous Code Division Multiple Access) system, be operated under UTRAN (the UMTS Terrestrial Radio Access Network) network architecture, it carried out standardization effort by 3GPP (3rd Generation Partner Project) standardization body.
The TD-SCDMA system adopts time division duplex (Time Division Duplex) mode, promptly up link and down link are not carried out separation on the carrier wave frequency range (Carrier frequency), but up link (Uplink) and down link (Downlink) are separated by different time slot (Time Slot).Provided the frame structure (, providing the download of document among the www.3gpp.org of 3GPP website) of TD-SCDMA system among Fig. 1 referring to TD-SCDMA system standard document 3GPP TS25.221.The duration of a TD-SCDMA frame (Frame) is 10ms; the frame of each TD-SCDMA is made of two subframes (Subframe); the duration of a subframe is 5ms; comprise 1 descending pilot frequency time slot (DwPTS), 1 uplink pilot time slot (UpPTS), 7 business time-slots in each subframe and protect (GP) at interval, 7 business time-slots are designated as TS0, TS1, TS2, TS3, TS4, TS5 and TS6 respectively.Wherein transmit descending synchronous signal channel (DwPCH) in the descending pilot frequency time slot; transmit uplink synchronous channel (UpPCH) in the uplink pilot time slot; transmit burst (Burst) in the business time-slot, comprise training sequence (Midamble), forward and backward data division (Data) and the protection interval of training sequence in 1 burst.In described 7 business time-slots, TS0 is always the downlink business time slot, transmit downlink burst, use for down link, in Fig. 1, represent with downward arrow, TS1 is always the uplink service time slot, transmit uplink burst, keep supplying line link and use, in Fig. 1, represent that with arrow upwards remaining 5 business time-slot all can be configured to uplink service time slot or downlink business time slot, switch by switching point (Switching point) between up link and the down link, there are two switching points in each TD-SCDMA subframe, are respectively the switching point that switches to up link by down link, and the switching point that switches to down link by up link.
Under above-mentioned TD-SCDMA frame structure, the quantity of and downlink business time slot up by flexible configuration can realize easily that the data under the different business demand transmit.For example, provided a kind of balanced configuration mode of uplink and downlink business time-slot among Fig. 1, wherein TS2, TS3 are configured to the uplink service time slot, and TS4, TS5, TS6 are configured to the downlink business time slot, are the switching point of up link and down link between TS3 and the TS4.Under the balanced configuration mode of the given uplink and downlink business time-slot of Fig. 1, the message transmission rate symmetry of up link and down link can be suitable for the zone based on voice service.Provided a kind of symmetrical arrangements mode of uplink and downlink business time-slot among Fig. 2, wherein TS2 is configured to the uplink service time slot, and TS3, TS4, TS5, TS6 are configured to the downlink business time slot, is the switching point of up link and down link between TS2 and the TS3.Under the symmetrical arrangements mode of the given uplink and downlink business time-slot of Fig. 2, down link has higher message transmission rate than up link, applicable to the zone based on data download service such as multimedia-on-demand.Downlink transmission speed is had in the business of higher demand, also can adopt as shown in Figure 3 asymmetric manner to the configuration of uplink and downlink business time-slot, wherein remove outside the uplink service time slot TS1 into system's fixed configurations, all the other business time-slot TS2 to TS5 all are configured to the downlink business time slot, are the switching point of up link and down link between TS1 and the TS2.
Yet, when according to different main business types, when disposing the up of respective numbers and downlink business time slot respectively for different zones, have not the same, therefore can produce between the neighbor cell of downlink business time slot configuration mode and disturb: be located at based on employing among the regional A of speech business as shown in Figure 1 on, downlink business time slot configuration mode, and in based on the adjacent area B of data download service, adopt as shown in Figure 2 on, downlink business time slot configuration mode, sub-district a among the described regional A is adjacent with the sub-district b in the described area B, then be not difficult to find out at business time-slot TS3 place, the Node B of described sub-district b is when sending signal, therefore the Node B of described sub-district a is in receiving state signal, and the transmission signal of the Node B of described sub-district b must produce the receiver of the Node B of its adjacent sub-district a and disturb; Equally at business time-slot TS3 place, the subscriber equipment of described sub-district a is when sending signal, the subscriber equipment of described sub-district b is in receiving state signal, the transmission signal of the subscriber equipment of then described sub-district a certainly will be also can produce the receiver of the subscriber equipment of described sub-district b and disturbs, under above-mentioned two kinds of interference cases, because the transmission signal power of the Node B of described sub-district b is its all downlink signal power sums, and if another subscriber equipment of a certain subscriber equipment of described sub-district a and sub-district b all is in the intersection of sub-district a and sub-district b, then above-mentioned two kinds of interference are strong jamming, respectively shown in arrow red among Fig. 4.
Thereby, for fear of the strong jamming that produces because of different uplink and downlink business time-slot configuration modes between above-mentioned neighbor cell, to adopt unified uplink and downlink business time-slot configuration mode for all sub-districts, and when changing uplink and downlink business time-slot configuration mode in system, all sub-district unifications are carried out, and do not done differentiation for the difference of type of service in the zones of different.Adopt this mode, though can avoid the strong jamming between described neighbor cell, but also lost the TD-SCDMA system according to different types of service simultaneously, the advantage of the different uplink and downlink business time-slot of flexible configuration quantity, make the configuration of TD-SCDMA system can not optimization, the capacity of having sacrificed system.
(3) summary of the invention
The objective of the invention is at producing the problem of interference because of different uplink and downlink business time-slot configuration modes between above-mentioned neighbor cell, propose to reduce in a kind of time-division-synchronous CDMA access system the method for presence of intercell interference, both can allow the TD-SCDMA system according to different types of service, quantity for the different different uplink and downlink business time-slots of regional flexible configuration, also can avoid simultaneously therefore producing between the neighbor cell in the described zones of different and disturb, thereby optimize the configuration of TD-SCDMA system, improve power system capacity.
Above-mentioned goal of the invention realizes by following method: the method that reduces presence of intercell interference in a kind of time-division-synchronous CDMA access system, it is characterized in that: according to the different service types in the described system zones of different, be respectively described zones of different configuration varying number on, the downlink business time slot, and ought be in respectively two adjacent sub-districts, when the downlink business number of timeslots disposes in the different zones, have in the business time-slot (time slot 3) of different configurations in described two adjacent sub-districts, arbitrary sub-district in the described two adjacent sub-districts is forbidden the use of described business time-slot (time slot 3), and in the described two adjacent sub-districts another sub-district on, downlink business time slot configuration mode remains unchanged.
According to an aspect of the present invention, in regional A based on voice service, TS2, TS3 are configured to the uplink service time slot, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on data download service, TS2 is configured to the uplink service time slot, and TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS3 of different configurations at described sub-district a and sub-district b, described sub-district a is forbidden the use of business time-slot TS3, and the uplink and downlink business time-slot configuration mode of described sub-district b remains unchanged; The uplink and downlink business time-slot configuration mode of perhaps described sub-district a remains unchanged, and described sub-district b is forbidden the use of business time-slot TS3.
According to another aspect of the present invention, in regional A based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on more at a high speed data download service, TS2, TS3, TS4, TS5, TS6 all are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS2 of different configurations at described sub-district a and sub-district b, described sub-district a is forbidden the use of business time-slot TS2, and the uplink and downlink business time-slot configuration mode of described sub-district b remains unchanged; The uplink and downlink business time-slot configuration mode of perhaps described sub-district a remains unchanged, and described sub-district b is forbidden the use of business time-slot TS2.
(4) description of drawings
Purpose of the present invention and feature will be elaborated in conjunction with the accompanying drawings by embodiment, and these embodiment are illustrative, not have restricted.
Fig. 1 represents the frame structure of TD-SCDMA system;
Fig. 2 represents that a kind of being applicable to the data download service is the symmetrical arrangements mode of the uplink and downlink business time-slot in the main region;
Fig. 3 represents a kind ofly to be applicable to that with high-speed data downloading service more be the symmetrical arrangements mode of the uplink and downlink business time-slot in the main region;
Therefore Fig. 4 represents to have between the neighbor cell in the different uplink and downlink business time-slot configuration modes zone and the interference that produces;
Fig. 5 represents one embodiment of the present of invention, and wherein Fig. 5 (a) expression has in the two adjacent sub-districts of different uplink and downlink business time-slot configuration modes the uplink and downlink business time-slot configuration mode of one of them sub-district; The uplink and downlink business time-slot configuration mode of another sub-district in Fig. 5 (b) expression described two adjacent sub-districts;
Fig. 6 represents an alternative embodiment of the invention, and wherein Fig. 6 (a) expression has in the two adjacent sub-districts of different uplink and downlink business time-slot configuration modes the uplink and downlink business time-slot configuration mode of one of them sub-district; The uplink and downlink business time-slot configuration mode of another sub-district in Fig. 6 (b) expression described two adjacent sub-districts;
(5) specific embodiment
Embodiments of the invention 1 have been provided among Fig. 5 and Fig. 6.
In embodiments of the invention 1, as shown in Figure 5, difference according to main business type in each zone of TD-SCDMA system, remove TS0 that is always the downlink business time slot that stipulates in the TD-SCDMA system standard and the TS1 that is always the uplink service time slot, in regional A based on voice service, TS2, TS3 is configured to the uplink service time slot, TS4, TS5, TS6 is configured to the downlink business time slot, and in the area B based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 is configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; As can be seen, in business time-slot TS3, described sub-district a has different configurations with neighbor cell b, therefore disturb for fear of therefore producing between sub-district a and the sub-district b, keep the configuration of the uplink and downlink business time-slot among the described sub-district a constant, as shown in Fig. 5 (a), and the use to business time-slot TS3 will be under an embargo in described sub-district b, shown in Fig. 5 (b).
In embodiments of the invention 1, the method according to this invention, also can be as shown in Figure 6, have among the business time-slot TS3 of different configurations at described sub-district a and neighbor cell b, described sub-district a is forbidden the use of described business time-slot TS3, as shown in Fig. 6 (a), and keep the configuration of the uplink and downlink business time-slot among the described sub-district b constant, as shown in Fig. 6 (b).
In embodiments of the invention 2, difference according to main business type in each zone of TD-SCDMA system, remove the TS0 that is always the downlink business time slot and the uplink service time slot TS1 that stipulate in the TD-SCDMA system standard, in regional A based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 is configured to the downlink business time slot, and in the area B based on more at a high speed data download service, TS2, TS3, TS4, TS5, TS6 all is configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Then as can be seen, in business time-slot TS2, described sub-district a has different configurations with neighbor cell b, therefore disturb for fear of therefore producing between sub-district a and the sub-district b, keep the configuration of the uplink and downlink business time-slot among the described sub-district a constant, and the use to business time-slot T2 will be under an embargo in described sub-district b; But the method according to this invention equally also, have among the business time-slot TS2 of different configurations at described sub-district a and neighbor cell b, described sub-district a is forbidden the use of described business time-slot TS2, and keep the configuration of the uplink and downlink business time-slot among the described sub-district b constant.
From embodiments of the invention as can be seen, use method of the present invention, both can allow the difference of TD-SCDMA system according to main business type in each zone of system, on its flexible configuration varying number, the downlink business time slot, and only at those be in have not the same, neighbor cell in the downlink business time slot configuration zone, have in the business time-slot of different configurations in described two adjacent sub-districts, arbitrary sub-district in the described two adjacent sub-districts is forbidden the use of described business time-slot, from and avoided therefore producing between the neighbor cell the described zones of different and disturbed, optimize the configuration of TD-SCDMA system, improved the capacity of system.
Claims (5)
1. reduce the method for presence of intercell interference in the time-division-synchronous CDMA access system, it is characterized in that: according to the different service types in the described system zones of different, be respectively described zones of different configuration varying number on, the downlink business time slot, and ought be in respectively two adjacent sub-districts, when the downlink business number of timeslots disposes in the different zones, have in the business time-slot (time slot 3) of different configurations in described two adjacent sub-districts, arbitrary sub-district in the described two adjacent sub-districts is forbidden the use of described business time-slot (time slot 3), and in the described two adjacent sub-districts another sub-district on, downlink business time slot configuration mode remains unchanged.
2. reduce the method for presence of intercell interference in the time-division-synchronous CDMA access system as claimed in claim 1, it is characterized in that in regional A based on voice service, TS2, TS3 are configured to the uplink service time slot, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS3 of different configurations at described sub-district a and sub-district b, described sub-district a is forbidden the use of business time-slot TS3, and the uplink and downlink business time-slot configuration mode of described sub-district b remains unchanged.
3. reduce the method for presence of intercell interference in the time-division-synchronous CDMA access system as claimed in claim 1, it is characterized in that in regional A based on voice service, TS2, TS3 are configured to the uplink service time slot, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS3 of different configurations at described sub-district a and sub-district b, the uplink and downlink business time-slot configuration mode of described sub-district a remains unchanged, and described sub-district b is forbidden the use of business time-slot TS3.
4. reduce the method for presence of intercell interference in the time-division-synchronous CDMA access system as claimed in claim 1, it is characterized in that in regional A based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on more at a high speed data download service, TS2, TS3, TS4, TS5, TS6 all are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS2 of different configurations at described sub-district a and sub-district b, described sub-district a is forbidden the use of business time-slot TS2, and the uplink and downlink business time-slot configuration mode of described sub-district b remains unchanged.
5. reduce the method for presence of intercell interference in the time-division-synchronous CDMA access system as claimed in claim 1, it is characterized in that in regional A based on data download service, TS2 is configured to the uplink service time slot, TS3, TS4, TS5, TS6 are configured to the downlink business time slot, and in the area B based on more at a high speed data download service, TS2, TS3, TS4, TS5, TS6 all are configured to the downlink business time slot, and sub-district a and sub-district b are in respectively in described regional A and the area B and are adjacent; Have among the business time-slot TS2 of different configurations at described sub-district a and sub-district b, the uplink and downlink business time-slot configuration mode of described sub-district a remains unchanged, and described sub-district b is forbidden the use of business time-slot TS2.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426935C (en) * | 2006-10-31 | 2008-10-15 | 华为技术有限公司 | Method and device for uplink random physical channel access in multiple small cell |
| CN101626578B (en) * | 2008-07-08 | 2012-06-06 | 中兴通讯股份有限公司 | Method for allocating downlink and uplink proportion |
| CN101626579B (en) * | 2008-07-08 | 2012-07-04 | 中兴通讯股份有限公司 | Method for allocating downlink and uplink proportion |
| CN102655676A (en) * | 2011-03-01 | 2012-09-05 | 华为技术有限公司 | Subframe configuration method, data processing method, base station and user equipment |
| WO2012131498A3 (en) * | 2011-03-31 | 2012-11-22 | Alcatel Lucent | Method, apparatus, base station and user equipment for reducing interference in a wireless communication system |
| CN103068050A (en) * | 2012-12-25 | 2013-04-24 | 上海无线通信研究中心 | Up and down slot time resource allocation method based on interference-aware in time division duplex system |
-
2004
- 2004-11-30 CN CN 200410097564 patent/CN1784068A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100426935C (en) * | 2006-10-31 | 2008-10-15 | 华为技术有限公司 | Method and device for uplink random physical channel access in multiple small cell |
| CN101626578B (en) * | 2008-07-08 | 2012-06-06 | 中兴通讯股份有限公司 | Method for allocating downlink and uplink proportion |
| CN101626579B (en) * | 2008-07-08 | 2012-07-04 | 中兴通讯股份有限公司 | Method for allocating downlink and uplink proportion |
| CN102655676A (en) * | 2011-03-01 | 2012-09-05 | 华为技术有限公司 | Subframe configuration method, data processing method, base station and user equipment |
| WO2012116639A1 (en) * | 2011-03-01 | 2012-09-07 | 华为技术有限公司 | Sub-frame configuration method, data processing method, base station, and user equipment |
| CN102655676B (en) * | 2011-03-01 | 2014-12-31 | 华为技术有限公司 | Subframe configuration method, data processing method, base station and user equipment |
| US9215699B2 (en) | 2011-03-01 | 2015-12-15 | Huawei Technologies Co., Ltd. | Method for configuring subframe, method for processing data, base station and user equipment |
| WO2012131498A3 (en) * | 2011-03-31 | 2012-11-22 | Alcatel Lucent | Method, apparatus, base station and user equipment for reducing interference in a wireless communication system |
| US9537623B2 (en) | 2011-03-31 | 2017-01-03 | Alcatel Lucent | Method, apparatus, base station and user equipment for reducing interference in a wireless communication system |
| CN103068050A (en) * | 2012-12-25 | 2013-04-24 | 上海无线通信研究中心 | Up and down slot time resource allocation method based on interference-aware in time division duplex system |
| CN103068050B (en) * | 2012-12-25 | 2016-12-28 | 上海无线通信研究中心 | Uplink and downlink timeslot resource allocation method based on interference perception in a kind of tdd systems |
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