CN1264361C - A method for speed assignation of forward direction alternate channel in CDMA system - Google Patents
A method for speed assignation of forward direction alternate channel in CDMA system Download PDFInfo
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- CN1264361C CN1264361C CN 200310116665 CN200310116665A CN1264361C CN 1264361 C CN1264361 C CN 1264361C CN 200310116665 CN200310116665 CN 200310116665 CN 200310116665 A CN200310116665 A CN 200310116665A CN 1264361 C CN1264361 C CN 1264361C
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Abstract
The present invention discloses a speed assignment method for forward supplementary channels in CDMA systems, which is applied to CDMA communication systems especially CDMA20001X systems. The method concretely comprises the following steps the scheduling time length of a forward supplementary channel is divided into an A segment and a B segment; after a system receives a resource request of a user to the forward supplementary channel, under the condition that no sufficient resource is assigned to the user, if one forward supplementary channel which is in the state B and is not pre-assigned is found out in all forward supplementary channels, one part of resource of the forward supplementary channel is assigned to the user; if the required forward supplementary channel is not found out, the system seeks one forward supplementary channel with least scheduled times and highest speed in all forward supplementary channels in the state A, informs the user to send the request when the channel is in the state B, and then assigns resources to the user. The method of the present invention shortens the scheduling time delay of the forward supplementary channels, ensures the fairness of the system, and enhances the utilization efficiency of resources.
Description
Technical field
The present invention relates to CDMA (code division multiple access) communication system, be specifically related to the method for forward complementary channel velocity allocating in the CDMA 2000 1X systems.
Background technology
The cdma system that meets the IS-2000 standard provides high-speed packet data service for the mobile subscriber, and the aerial physical channel that carries this business is a forward complement channel.The forward complement channel message transmission rate is often used 1X, 2X, and 4X ..., the form of 16X is expressed, and wherein X is a basic rate unit, and that stipulates in the IS-2000 standard has two kinds of 9600bit/s and 14400bit/s.Message transmission rate is high more, and system is also many more to the resource that this physical channel distributes, and both are directly proportional.The resource that forward complement channel uses comprises: Channel Elements (referring to the processing unit on the modem chip), walsh code, frame biasing and power resource.
The maximum characteristics that data service is different from speech business are exactly sudden, always discontinuous according to the statistics user to the request of high-speed data, so distribute to request user's forward complement channel a time span is arranged all, we are called scheduling duration Duration (being called for short D in the accompanying drawing).The product of Duration and forward complementary channel velocity has been represented this forward complement channel disposal ability once, just throughput.The supplemental channel scheduling technology that we often say is exactly by adjusting the technology that Duration and forward complementary channel velocity reach channel resource reasonable distribution between the user.
In the prior art, name is called the patent (Chinese patent: application number 01140107.9 of " a kind of be used for Packet data service scheduling of resource under the mobile environment and the new algorithm of distribution ", publication number 1347253) proposes when the multi-user who utilizes maximum C/I algorithm divides stage gain, overcome it and do not satisfied the defective of fairness, by angle from throughput and fairness compromise, found a kind of approximate optimal solution, promptly reach the purpose that improves throughput of system, also improved fairness in a sense.But the shortcoming of this patent is the phase I that is not suitable for CDMA 20001X, reason is: owing to adopted rate control techniques in CDMA 20001X EVDO, can measure a pilot tone C/I by each time slot, and not have this technology in the CDMA 20001X phase I.
At present, the fairness best method is the repeating query method in the forward complement channel scheduling, and this method is made no exception the even odds of each CU resource to each application user.But there is following shortcoming in this method: do not consider the utilization ratio of channel, causing between each user in turn, Resources allocation is unfavorable for improving the efficient of the utilization of resources.
Summary of the invention
The purpose of this invention is to provide a kind of cdma communication system that is applicable to, the method of the forward complementary channel velocity allocating of CDMA 2000 1X systems particularly, the system that makes guaranteeing under the prerequisite of total throughout, fair, efficiently distributes the forward complement channel resource for each user.
Technical scheme of the present invention is, when being forward complement channel assignment speed, the factor of request high-speed data service number of users as the decision forward complementary channel velocity allocating, select the mode that highspeed user's resource that it is shared splits when resource-constrained, concrete steps comprise:
The first step is to represent the object of forward complement channel to add two attributes in the base station system: consumer premise number of times sign, the user's who is used for the shared resource of this forward complement channel recording scheduled number; Allocate sign in advance, be used to write down the shared resource of this forward complement channel and whether allocated in advance to certain user;
The scheduling duration of second step with forward complement channel is divided into two sections that are in A, B state: the scope of state A is counted from the scheduling duration zero hour, time span is that the scheduling duration deducts a scheduled time constant T, the scope of state B is counted from A the finish time, and time span is T; Described T sends Extended Supplemental Channel Assignment Message more than or equal to the base station and receives Extended Supplemental Channel Assignment Message institute spended time to travelling carriage, dispatches duration less than the minimum that system supports;
After the 3rd step cdma system receives the forward complement channel request that a user sends, if cdma system has enough resources then this user is carried out resource allocation; If no, then cdma system is sought one and is in state B and not pre-assigned forward complement channel F1 from all forward complement channels, gives the request user with the local channel resource allocation that F1 uses, and replacement F1 allocate sign in advance;
If the 4th step was not found desired forward complement channel F1 in the 3rd step, then cdma system is at all and seeks the minimum forward complement channel set of pre-determined number in the forward complement channel of state A, and in this set, select a highest forward complement channel F2 of speed, notice request user sends request again when F2 is in state B, and revises the pre-determined number of F2;
After the forward complement channel resource allocation success of the 5th step user request, the base station sends Extended Supplemental Channel Assignment Message to travelling carriage, and the notice travelling carriage begins the forward complement channel demodulation in the time of appointment.
Because the priority of the time of user applies forward complement channel is at random; when the data user is many; the situation that a few users has taken more resource appears through regular meeting; the method of the invention is adjusted the assignment of forward complementary channel velocity at any time according to number of users; user's response time and efficiency of resource have been improved; guarantee the fairness of system, shortened the scheduling time delay of forward complement channel.
Description of drawings
Fig. 1 is forward complement channel scheduling duration Duration state division figure in the method for the invention;
Fig. 2 is the flow chart of the method for the invention.
Embodiment
With forward direction complement channel available resources is that the system of 28X is an example, and the present invention is described in detail in conjunction with the accompanying drawings.
Fig. 1 is forward complement channel scheduling duration Duration state division figure, the state of being divided into is in A, B two sections: the scope of state A is counted from the scheduling duration zero hour, time span is that the scheduling duration deducts a scheduled time constant T, be D-T, the scope of state B is counted from A the finish time, and time span is T; T sends Extended Supplemental Channel Assignment Message more than or equal to the base station and receives Extended Supplemental Channel Assignment Message institute spended time to travelling carriage, dispatches duration less than the minimum that system supports.
Single user's flank speed of system's support is 16X at present, and under the condition of system resource abundance, the base station is to the flank speed of each forward complement channel application according to the current support of principle assignment that arrives first elder generation's processing.Elaborate embodiments of the invention below in conjunction with Fig. 2.
When having only a data user applies forward complement channel under the carrier frequency, shown in 203,204,205 steps among Fig. 2, the base station is to after this user's assignment 16X rate resource success, the base station sends Extended Supplemental Channel Assignment Message to travelling carriage, and the notice travelling carriage begins the forward complement channel demodulation in the time of appointment.
When two user applies forward complement channels are arranged under the carrier frequency, shown in 203,204,205 steps among Fig. 2, the base station to first user's assignment 16X speed, the success of second user's assignment 8X rate resource after, the base station sends Extended Supplemental Channel Assignment Message to travelling carriage, and the notice travelling carriage begins the forward complement channel demodulation in the time of appointment.
When three user applies complement channels are arranged under the carrier frequency, shown in 203,204,205 steps among Fig. 2, the base station is first user's assignment 16X speed, is the speed (28X=16X+8X+4X) that second user's assignment 8X speed, third party can only obtain 4X.After the Resources allocation success, the base station sends Extended Supplemental Channel Assignment Message to travelling carriage, and the notice travelling carriage begins the forward complement channel demodulation in the time of appointment.This moment, the forward complement channel resource was all occupied.
When four user applies forward complement channels are arranged under the carrier frequency, because the base station is according to arriving first the first principle of handling to first three user assignment speed 16X, 8X, 4X, when the 4th user's application arrives, shown in step 203, the base station thinks do not have enough forward complement channel resources can supply to distribute through resource judgment.Shown in step 206, if finding one, to be in state B and pre-assigned labels RR_Release be 0 forward complement channel F1, shown in step 207, base station system is just given the application user with half resource allocation of F1, according to step 208 allocating in advance of F1 indicated that attribute RR_Release is changed to 1, the resource of expression F1 has been pre-assigned to other user; Send the forward complement channel of ESCAM message informing travelling carriage according to step 209 base station to the travelling carriage of this application forward complement channel at the moment of appointment demodulation assigned rate; Return the result of this resource allocation according to step 213 system, wait for that next forward complement channel resource bid arrives.Shown in step 210, if be not in the forward complement channel F1 of state B, base station system is just sought from three forward complement channels having set up and is in state A and the minimum forward complement channel of pre-determined number, note RR_Count less than maximum reservation number of times MAX_COUNT, present embodiment MAX_COUNT defaults to 3; According to step 211, if more than one is just selected a highest forward complement channel of speed in the result.In the present embodiment owing to set up the record that forward complement channel is not preengage, so what find is that speed is the forward complement channel F2 of 16X, the pre-determined number RR_Count of F2 is added 1, and notify user 4 to send forward complement channel again according to step 212 and set up request in the zero hour of F2 state B, return the result of this resource allocation according to step 213 system, wait for that next forward complement channel resource bid arrives.Shown in step 206, when user 4 forward complement channel application arrives once more, a user F1 who is in state B is arranged just in time, its pre-assigned labels RR_Release is 0, user 4 is given in half forward complement channel resource allocation that base station system just takies F1.Through after this speed adjustment, the speed of 4 user's dominations is respectively 8X, 8X, 8X, 4X.
As a same reason, when 5 user applies forward complement channels are arranged under the carrier frequency, through this employing inventive method, user's speed combination be (8X, 8X, 4X, 4X, 4X).When 6 users, user's speed combination be (8X, 4X, 4X, 4X, 4X, 4X).When 7 users are arranged, user's speed combination be (4X, 4X, 4X, 4X, 4X, 4X, 4X).
If current have three users respectively with 16X, 8X, the speed rates of 4X.Have 4 users to initiate the application of forward complement channel simultaneously this moment again, and according to the inventive method, the forward complement channel of 16X is preengage by 2 users, and the forward complement channel of 8X is preengage by 1 user, and the forward complement channel of 4X is preengage by 1 user.Because subscriber initiates to have applied for sequencing once more, so only have the channel resource that 3 subscriber are divided, adjusted speed is 8X, 8X, 4X, 4X, at this moment 2X, 2X. also have 1 user not assign to channel resource, so this user will initiate reservation once more, shown in 206,210 steps among Fig. 2, will preengage the forward complement channel of a 8X, like this through twice adjustment, will be 8X in the speed of 7 users' of next scheduling duration forward complement channel, 4X, 4X, 4X, 4X, 2X, 2X.
When the number of users minimizing, the resource that withdraws from CU is released, and at this moment other users can use resource to increase, and the speed that is assigned raises, and this method stands good.
Claims (5)
1, forward complementary channel velocity allocating method in a kind of cdma system is characterized in that may further comprise the steps:
The first step is to represent the object of forward complement channel to add two attributes in the base station system: consumer premise number of times sign, the user's who is used for the shared resource of this forward complement channel recording scheduled number; Allocate sign in advance, be used to write down the shared resource of this forward complement channel and whether allocated in advance to certain user;
The scheduling duration of second step with forward complement channel is divided into two sections that are in A, B state: the scope of state A is counted from the scheduling duration zero hour, time span is that the scheduling duration deducts a scheduled time constant T, the scope of state B is counted from A the finish time, and time span is T; Described T sends Extended Supplemental Channel Assignment Message more than or equal to the base station and receives Extended Supplemental Channel Assignment Message institute spended time to travelling carriage, dispatches duration less than the minimum that system supports;
After the 3rd step cdma system receives the forward complement channel request that a user sends, if cdma system has enough resources then this user is carried out resource allocation; If no, then cdma system is sought one and is in state B and not pre-assigned forward complement channel F1 from all forward complement channels, gives the request user with the local channel resource allocation that F1 uses, and replacement F1 allocate sign in advance;
If the 4th step was not found desired forward complement channel F1 in the 3rd step, then cdma system is at all and seeks the minimum forward complement channel set of pre-determined number in the forward complement channel of state A, and in this set, select a highest forward complement channel F2 of speed, notice request user sends request again when F2 is in state B, and revises the pre-determined number of F2;
After the forward complement channel resource allocation success of the 5th step user request, the base station sends Extended Supplemental Channel Assignment Message to travelling carriage, and the notice travelling carriage begins the forward complement channel demodulation in the time of appointment.
2, forward complementary channel velocity allocating method in a kind of cdma system according to claim 1 is characterized in that, in the described first step, the sign of pre-determined number does not have at described forward complement channel that initial value is 0 when scheduled; Pre-assigned sign is not changed to 0 when described forward complement channel is allocated in advance, otherwise is changed to 1.
3, forward complementary channel velocity allocating method in a kind of cdma system according to claim 1, it is characterized in that, the pre-determined number of revising F2 in described the 4th step is meant: when notice request user sends request when F2 is in state B, the pre-determined number of F2 is added 1.
4, forward complementary channel velocity allocating method in a kind of cdma system according to claim 1, it is characterized in that, in described the 5th step, system with described forward complement channel resource allocation success after, then with its attribute pre-determined number sign with allocate sign in advance and all be changed to 0.
5, according to forward complementary channel velocity allocating method in claim 1 or the 3 described a kind of cdma systems, it is characterized in that the scheduled number of times of described forward complement channel can not surpass preset value.
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| CN 200310116665 CN1264361C (en) | 2003-11-25 | 2003-11-25 | A method for speed assignation of forward direction alternate channel in CDMA system |
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| CN 200310116665 CN1264361C (en) | 2003-11-25 | 2003-11-25 | A method for speed assignation of forward direction alternate channel in CDMA system |
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| CN100372424C (en) * | 2005-11-11 | 2008-02-27 | 华为技术有限公司 | Carrier frequency scheduling method for data business |
| JP4256882B2 (en) * | 2006-06-19 | 2009-04-22 | 株式会社エヌ・ティ・ティ・ドコモ | Base station, video distribution system, and distribution control method |
| CN101136850B (en) * | 2007-01-23 | 2010-06-16 | 中兴通讯股份有限公司 | Method for determining start time of complementary channel |
| CN101674151B (en) * | 2008-09-09 | 2014-06-11 | 株式会社Ntt都科摩 | Method for allocating resource, base station and mobile communication terminal |
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