CN1176563C - Dynamic channel allocating method - Google Patents
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- CN1176563C CN1176563C CNB011022590A CN01102259A CN1176563C CN 1176563 C CN1176563 C CN 1176563C CN B011022590 A CNB011022590 A CN B011022590A CN 01102259 A CN01102259 A CN 01102259A CN 1176563 C CN1176563 C CN 1176563C
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Abstract
The present invention discloses a dynamic channel allocation (DCA) method of TDD-CDMA mobile communication systems. In the present invention, mobile stations MS are classified according to the distance of the sub-zone base stations BS; code channels in the same code channel set (carrier frequencies and time slots) are allocated to the mobile stations MS with approximate distance; simultaneously, the mobile stations MS with different distance have different requirements to transmitting power and have different interference to adjacent sub-zones; a system determines whether crossed time slot code channel sets can be used, and determines the type of the used multiplex factor code channel sets. The method of the present invention can effectively avoid interference, enhance capacity and cause the networking of TDD-CDMA systems to be easily realized.
Description
Technical field
The present invention relates to code division multiple access (CDMA) mobile communication technology field, relate in particular to a kind of dynamic channel assignment method in time division duplex-code division multiple access (TDD-CDMA) system.
Background technology
In the middle of the communication system of time division multiple access (TDMA) and frequency division multiple access (FDMA), its interchannel itself is a quadrature, need not to consider the interference problem of interchannel.The dynamic channel allocation of TDMA and FDMA communication system (DCA) is relatively simple, only needs to consider to obtain channel the compactest multiplexing method on distance under the situation of co-channel interference satisfying.And always suppose worst situation in the process of considering this problem, promptly Yin Han hypothesis is that the distance of travelling carriage and base station is a radius of society, and this must cause the reduction of spectrum efficiency.In Frequency Division Duplexing (FDD)-code division multiple access (FDD-CDMA) system, because uplink and downlink adopt 2 carrier frequency, therefore there is not the interference of travelling carriage-travelling carriage (MS-MS) and base-station, base-station (BS-BS), the DCA scheme that it adopts is also simple relatively.
TDD-CDMA system uplink (UL) and descending (DL) adopt same carrier frequency, can satisfy the demand of asymmetric traffic.The possible inconsistent generation that causes cross time-slot of the type of service of each sub-district.That cross time-slot is meant that in this time slot a sub-district is in is up/or it is descending, and that its neighbor cell is in is descending/or up.Have 4 kinds of presence of intercell interference in the TDD-CDMA system: the BS in non-cross time-slot is to the interference of MS and the MS interference to BS, and the MS in cross time-slot is to the interference of MS and the BS interference to BS.Especially the interference in the cross time-slot, because the transmitting power of BS and receiving gain be all than higher, and two MS may be very approaching, therefore disturbs very seriously, can bring difficulty to system group network.
Summary of the invention
In view of above-mentioned TDD-CDMA system can realize asymmetric traffic, but may cause serious presence of intercell interference simultaneously, purpose of the present invention just is to provide dynamic channel allocation (DCA) method of a kind of TDD-CDMA system, can reduce interference, increase capacity, make things convenient for system group network.
The dynamic channel assignment method of a kind of TDD-CDMA mobile communication system of the present invention is a travelling carriage according to classifying with the distance of this cell base station, and distributes the code channel in the same code channel group to give distance close travelling carriage; Simultaneously different code channel groups allows to adopt the different multiplexing factors.
According to the invention described above technical scheme, described code channel group far is divided into three groups according to the distance of travelling carriage and base station by discharging, and is respectively cross time-slot code channel group, low-power code channel group and high power code channel group; And low-power code channel group is adopted the multiplexing factor is 1, adopts the multiplexing factor less than 1 to high power code channel group.
Distance according to travelling carriage and this cell base station determines whether to distribute the code channel of cross time-slot code channel group to give this travelling carriage for the code channel of the code channel group of this travelling carriage or which kind of multiplexing factor.Specifically can comprise the steps:
(a) two distance alpha r and β r are at first determined according to system requirements in the base station, and wherein r is a radius of society, α＜β＜1;
(b) after the channel request of travelling carriage is received in the base station, judge travelling carriage and base station apart from d;
(c) if d＜α r, then preface is sought idle code channel respectively and is distributed in cross time-slot code channel group, low-power code channel group and high power code channel group successively;
(d) if α r＜d＜β r, then preface is sought idle code channel respectively and is distributed in low-power code channel group and high power code channel group successively;
(e) if d＞β r then seeks idle code channel and distributes in high power code channel group.
In the invention described above method, to adopt the multiplexing factor be 1 to distributing to the code channel group apart from the travelling carriage of d＜β r with the base station; To distribute to the base station apart from the code channel group of the travelling carriage of d＞β r and switch and keep channel and adopt the multiplexing factor less than 1.
A described code channel group is meant that a carrier frequency adds the code channel in the time slot combination.
The DCA method of TDD-CDMA of the present invention system is classified according to the distance of travelling carriage and base station, and the code channel in the code channel group is distributed to the close travelling carriage of distance; Simultaneously, according to different code channel groups to the different mining of the annoyance level of adjacent cell with the different multiplexing factors, can avoid interference effectively, the raising capacity makes the networking of TDD-CDMA system be easy to realize.
Description of drawings
Fig. 1 is the frame structure schematic diagram of the embodiment of the invention.
Fig. 2 is the sub-district distribution schematic diagram of the embodiment of the invention.
Fig. 3 is the schematic flow sheet of the embodiment of the invention.
Embodiment
The present invention is further described in more detail below in conjunction with drawings and the specific embodiments.
In the middle of the TDD-CDMA system, operator may have a plurality of carrier frequency, and a frame of each carrier frequency has a plurality of time slots, in the middle of each time slot, is divided into some code channels with spreading code.At this, define the code channel group that is combined as of a carrier frequency+time slot.Because protection frequency range between the carrier frequency and the guard time between the time slot, the interference between each code channel group can be ignored.
Electromagnetic wave is in the middle of the spatial transmission process, and its power is decayed with the increase of distance.Therefore need bigger transmitting power apart from BS MS far away, uplink and downlink are not always the case, and this MS is inevitable nearer apart from the distance of certain neighbor cell simultaneously, must be bigger to its interference.Opposite, the transmitting power that the MS nearer apart from BS needs is smaller, and also far away from the distance of neighbor cell, and therefore the interference that causes is also less.The TDD-CDMA system dynamics method for channel allocation that the present invention proposes is according to the distance between MS and the BS user to be classified, and will be arranged in identical code channel group apart from close user.So, first has reduced the interference of minizone: for arranging closely user's code channel group, if the distance between neighbor cell satisfies the minimum multiplex distance of channel, interference among adjacent cells can be ignored so; Second has reduced the multiple access in the sub-district disturbs: if having closely user and remote subscriber in a code channel group, in the descending stage, the remote subscriber can cause closely user's strong multiple access interference; Because the result of power control will cause the closely increase of user emission power, cause the reinforcement that adjacent cell is disturbed again.
The radius of supposing the sub-district is r, can determine two distances according to system requirements when specific implementation: α r and β r, wherein α＜β＜1.
At first, because in the interference that exists in the middle of the cross time-slot between peculiar BS-BS of TDD mode and the MS-MS, therefore cross time-slot is arranged to user closely, the transmitting power of transmitter is little on the one hand, also avoided 2 situations that MS is very approaching on the other hand, can avoid interference effectively.That is, the code channel group that will be in cross time-slot only arrange to the user of base station distance＜α r.
Secondly, according to different code channel groups to the different mining of the annoyance level of adjacent cell with the different multiplexing factors:
The code channel group of distributing to base station distance＜β r user is adopted the multiplexing factor 1, this is that identical code channel group can be used in all sub-districts owing to the desired transmitting power of user with base station distance＜β r can satisfy system requirements to the interference of neighbor cell;
Code channel group to some adopts the multiplexing factor less than 1, be used for keeping channel with user and the switching of base station distance＞β r, this is because the transmitting power that the MS far away apart from BS needs is bigger, must cause interference to adjacent cell, can be avoided less than 1 the multiplexing factor by the code channel group of arranging the remote subscriber is adopted, this code channel group is not used in the sub-district that is in the interference region, and this code channel group can be reused outside interference region.
Provide the example of dynamic channel allocation in the concrete TD-SCDMA system below.
An operator has 3 carrier frequency, is labeled as C1, C2, C3 respectively.The subframe structure of this system as shown in Figure 1, a subframe has 7 standard time slots, is labeled as Ts0～Ts6 respectively, wherein Ts0 one is decided to be descending time slot, Ts1 one is decided to be ascending time slot, has one to be up to descending transfer point between Ts2～Ts5, and its position can be set according to service needed.A code channel group is come mark with C#Ts#.Consider 3 sub-districts in the communication system, as shown in Figure 2.Suppose that according to business demand the division of uplink and downlink time slot on each carrier frequency of 3 sub-districts sees Table 1.
Table 1
| Carrier frequency 1 | Carrier frequency 2 | Carrier frequency 3 | ||||
| Up | Descending | Up | Descending | Up | Descending | |
| Sub-district 1 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 |
| Sub-district 2 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 |
| Sub-district 3 | Ts1?Ts2 Ts3 | Ts4?Ts5 Ts6?Ts0 | Ts1?Ts2 | Ts3?Ts4 Ts5?Ts6 Ts0 | Ts1?Ts2 | Ts3?Ts4 Ts5?Ts6 Ts0 |
On the carrier frequency 1 each sub-district be provided with identically, do not have cross time-slot, the Ts3 of carrier frequency 2 and carrier frequency 3 is a cross time-slot.High power code channel group, cross time-slot code channel group and the low-power code channel group that use each sub-district are respectively shown in table 2, table 3 and table 4.Wherein the multiplexing factor of high power code channel group employing is 1/3, and the multiplexing factor that low-power code channel group adopts is 1, and cross time-slot code channel group has only the travelling carriage that satisfies neighbor cell cross time-slot interference requirement just can use.
The high power code channel group of each sub-district of table 2
| Up | Descending | |
| Sub-district 1 | ?C1Ts1， | ?C1Ts0 |
| Sub-district 2 | ?C2Ts1 | ?C2Ts0 |
| Sub-district 3 | ?C3Ts1 | ?C3Ts0，C3Ts6 |
The cross time-slot code channel group of each sub-district of table 3
| Up | Descending | |
| Sub-district 1 | ?C2Ts3，C3Ts3 | |
| Sub-district 2 | ?C2Ts3，C3Ts3 | |
| Sub-district 3 | ?C2Ts3，C3Ts3 |
The low-power code channel group of each sub-district of table 4
| Up | Descending |
| C1Ts2，C1Ts3，C2Ts2，C3Ts2 | C1Ts4，C1Ts5，C1Ts6， C2Ts4，C2Ts5，C2Ts6， C3Ts4，C3Ts5 |
Dynamic channel allocation is to the process of channel request response as shown in Figure 3:
(a) Mobile Origination channel request;
(b) the travelling carriage channel request is received in the base station, judge travelling carriage and base station apart from d;
(c) do you judge d＜α r? if then seeking idle code channel successively in cross time-slot code channel group, low-power code channel group and high power code channel group distributes; Otherwise
(d) do you judge α r＜d＜β r? if then seeking idle code channel successively in low-power code channel group and high power code channel group distributes; Otherwise
(e) seeking idle code channel in high power code channel group distributes.
One of advantage of TDD-CDMA system is to adopt the TDD mode, can satisfy the needs of asymmetric traffic, but MS-MS between the neighbor cell that brings thus and the interference of BS-BS bring difficulty to its networking, and DCA method provided by the invention is to solve one of this difficult key technology.In the middle of TDMA and FDMA communication system, its interchannel itself is a quadrature, need not consider the interference problem of interchannel.The DCA of TDMA and FDMA communication system is relatively simple, only needs to consider to obtain channel and obtain the compactest method for reusing on distance.In the middle of FDD-CDMA, because uplink and downlink adopt 2 carrier frequency, therefore there is not the interference of MS-MS and BS-BS, the DCA scheme that it adopts is also simple relatively.And a carrier frequency is adopted in the uplink and downlink of TDD-CDMA, brings extra interference thus, needs to adopt complicated more DCA scheme.In DCA method of the present invention, to classify according to the distance of MS and base station, the code channel in code channel group is distributed to the close MS of distance.Simultaneously according to different code channel groups to the different mining of the annoyance level of adjacent cell with the different multiplexing factors, this is with the identical multiplexing factor difference of all channels employings within the former sub-district.Adopt DCA method of the present invention, can avoid interference effectively, the raising capacity makes the networking of TDD-CDMA system be easy to more realize.
The present invention be with mobile station MS according to classifying with the distance of this cell base station BS, the code channel in the same code channel group (carrier frequency+time slot) is distributed to the close mobile station MS of distance; The MS of different distance is to the requirement difference of transmitting power simultaneously, and also different to the interference of neighbor cell, system determines the code channel group whether it can use cross time-slot code channel group and use which kind of multiplexing factor according to the requirement of MS to transmitting power.All within above-mentioned 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 (5)
1, a kind of dynamic channel assignment method of TDD-CDMA mobile communication system is characterized in that this method comprises:
According to classifying, and distribute the code channel in the same code channel group to give distance close travelling carriage travelling carriage with the distance of this cell base station; Simultaneously different code channel groups allows to adopt the different multiplexing factors;
Wherein, a described code channel group is that a carrier frequency adds the code channel in the time slot combination.
2, dynamic channel assignment method according to claim 1 is characterized in that: described code channel group is divided into three groups from the near to the remote according to the distance of travelling carriage and base station, is respectively cross time-slot code channel group, low-power code channel group and high power code channel group; And low-power code channel group is adopted the multiplexing factor is 1, adopts the multiplexing factor less than 1 to high power code channel group.
3, dynamic channel assignment method according to claim 2 is characterized in that this method further comprises: the distance according to travelling carriage and this cell base station determines whether to distribute the code channel of cross time-slot code channel group to give this travelling carriage for the code channel of the code channel group of this travelling carriage or which kind of multiplexing factor.
4, dynamic channel assignment method according to claim 3 is characterized in that this method specifically comprises:
(a) determine two distance alpha r and β r according to system requirements, wherein r is a radius of society, α＜β＜1;
(b) after the channel request of travelling carriage is received in the base station, judge travelling carriage and base station apart from d;
(c) if d＜α r, then preface is sought idle code channel respectively and is distributed in cross time-slot code channel group, low-power code channel group and high power code channel group successively;
(d) if α r＜d＜β r, then preface is sought idle code channel respectively and is distributed in low-power code channel group and high power code channel group successively;
(e) if d＞β r then seeks idle code channel and distributes in high power code channel group.
5, dynamic channel assignment method according to claim 4 is characterized in that this method further comprises: to adopt the multiplexing factor be 1 to distributing to the code channel group apart from the travelling carriage of d＜β r with the base station; To distribute to the base station apart from the code channel group of the travelling carriage of d＞β r and switch and keep channel and adopt the multiplexing factor less than 1.
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Families Citing this family (17)
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| TWI225339B (en) | 2002-06-06 | 2004-12-11 | Via Telecom Co Ltd | Power control of plural packet data control channels |
| US7680475B2 (en) * | 2004-06-09 | 2010-03-16 | Qualcomm Incorporated | Dynamic ASBR scheduler |
| CN100382634C (en) * | 2004-07-14 | 2008-04-16 | 中兴通讯股份有限公司 | A method of dynamic channel allocation for TD-SCDMA communication system |
| CN100372422C (en) * | 2004-09-28 | 2008-02-27 | 大唐移动通信设备有限公司 | Dynamic channel distributing method for realizing cross time slot based on intelligent antenna |
| WO2006043588A1 (en) * | 2004-10-19 | 2006-04-27 | Sharp Kabushiki Kaisha | Base station device, wireless communication system, and wireless transmission method |
| CN100356812C (en) * | 2004-12-06 | 2007-12-19 | 大唐移动通信设备有限公司 | Method for dynamic channel allocation of multi carrier time division duplex communication system |
| WO2006069489A1 (en) * | 2004-12-31 | 2006-07-06 | Utstarcom Telecom Co., Ltd. | Method and base station for uplink timeslot assignment in utra tdd system |
| CN100409714C (en) * | 2005-04-22 | 2008-08-06 | 北京邮电大学 | Method for assigning carrier frequency and timeslot in time division duplexing - CDMA system |
| CN100471316C (en) * | 2005-04-28 | 2009-03-18 | 北京邮电大学 | Method for dynamic channel allocation in TD-SCDMA system |
| CN100435493C (en) * | 2005-05-20 | 2008-11-19 | 上海原动力通信科技有限公司 | Method for downlink power control of base station |
| CN101079663B (en) * | 2006-05-24 | 2012-12-05 | 方正通信技术有限公司 | Method, base station and system for reducing interference of adjacent cells of wireless cellular system |
| CN101222728B (en) * | 2007-01-09 | 2010-08-25 | 华为技术有限公司 | Method and system for using time frequency resource in OFDMA system |
| CN101459963B (en) * | 2007-12-10 | 2010-06-02 | 普天信息技术研究院有限公司 | Dynamic channel allocation method in mobile communication system |
| CN101541046B (en) * | 2008-03-20 | 2012-10-31 | 电信科学技术研究院 | Method, device, user equipment and base station for determining resource information |
| CN101466140B (en) | 2008-12-15 | 2011-07-13 | 中兴通讯股份有限公司 | Method for improving call success rate and base station system thereof |
| US9204441B2 (en) * | 2012-05-02 | 2015-12-01 | Qualcomm Incorporated | Method and apparatus for classifying femto node users |
| US20220068120A1 (en) * | 2020-08-27 | 2022-03-03 | Blackberry Limited | Method and apparatus for providing road user alerts |
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