CN105636212B - A Method for Adaptive Allocation of Radio Resources in TDSCDMA System - Google Patents

Abstract

The present invention provides a strategy for self-adaptive allocation of wireless resources, which specifically includes the following steps: Step 1. When data services are accessed, the initial access rate is set according to the current base station load. Carry out deceleration preemption; Step 2, for the data business that has been connected, carry out traffic monitoring at Iu interface place; Step 3, according to the result of traffic monitoring, carry out speed-up, deceleration or State transition; step 4, for the CELL_PCH user, if there is data transmission, the state transition will be performed, and if there is no data transmission for a long time, the user will be released. The wireless resource self-adaptive allocation strategy of the present invention reduces resource congestion caused by small-flow data services, improves resource utilization, and effectively reduces network load caused by signaling.

Description

A Method for Adaptive Allocation of Radio Resources in TDSCDMA System

technical field

The present invention relates to the technical field of wireless communication system TDSCDMA, in particular to a strategy for self-adaptive allocation of wireless resources.

Background technique

TDSCDMA is the abbreviation of English Time Division-Synchronous Code Division Multiple Access (Time Division Synchronous Code Division Multiple Access). In the cells of cellular communication systems such as TDSCDMA, the wireless physical resource pool consists of carrier frequency, orthogonal code and transmission time slot. In a single-carrier system, a code channel is used as the basic unit of resource allocation, and a code channel is jointly determined by an orthogonal code and a time slot. In addition to the dedicated physical channels allocated to users, the system also configures public physical channels for functions such as paging and random access.

With the development of wireless communication technology and the popularization of smart phone terminals, the proportion of data services in the total business has increased rapidly, and some background applications of smart phones (such as WeChat, etc.) will frequently send heartbeat information (terminals periodically send heartbeat messages to The application server sends a short message) and a service establishment request. These services are characterized by suddenness, short duration and low traffic.

TDSCDMA is a typical CDMA system, and its performance is limited by wireless resources. If the signaling and data of the above-mentioned small-traffic services are always carried on dedicated physical resources, the dedicated physical resources will be exhausted quickly, and the network will also fail. It will be in a congested state from time to time, affecting the user's access performance and the utilization efficiency of wireless resources. Therefore, reasonable use of wireless resource reconfiguration to reduce the occupation of dedicated physical resources, or use of state transition to increase the use of common physical resources are methods that can improve the utilization of wireless resources.

CELL_DCH. In this state, the UE uses the uplink-downlink dedicated physical channel (DPCH) and the physical downlink shared channel (PDSCH). This state can be entered from idle mode or by establishing a dedicated physical channel in the CELL_FACH state.

CELL_PCH. In this state, there is no dedicated physical channel connection between the UE and UTRAN, and the UE cannot use any uplink physical channel. In this state, in order to save power consumption, the UE can use the DRX method to monitor the PCH channel indicated by the PICH. The UTRAN knows the cell where the UE is currently located according to the last cell update procedure performed by the UE in the CELL_FACH state last time. If the UE needs to send uplink data (response to paging or initiate a call), it must first transfer from the CELL_PCH state to the CELL_FACH state.

Contents of the invention

The purpose of the present invention is to reduce resource congestion caused by small-flow data services, improve resource utilization, and effectively reduce network load caused by signaling, and propose a wireless resource self-adaptive allocation strategy.

The technical solution of the present invention is: a method for wireless resource adaptive allocation in a TDSCDMA system, comprising the steps of:

Step 1. When data services are accessed, the initial access rate is set according to the current base station load. If there are no available wireless resources, the data services that have been accessed are preempted by reducing the speed; among them, the initial access rate of user i is the currently available uplink wireless resources, that is, the number of available uplink BRUs;

Step 2: After user i establishes a radio access bearer, start a timer with a period of T _flow , and count the number of received bits of user i at the Iu interface Then the actual rate of user i

Step three, when When , the adjustment speed of user i is Where S _i is the current service rate of user i. If S′ _i ≠ S _i , the speed will be increased or decreased through the radio bearer reconfiguration process; if S′ _i = S _i , no processing will be performed; when When , the user state is migrated to CELL_PCH, and the dedicated wireless resources are released;

Step 4. When the user enters the CELL_PCH state, start the timer T _PCHTOIDLE ; before the timer expires, there is data transmission, terminate the timer, and the user state migrates to CELL_DCH; after the timer expires, release the user's Iu connection and RRC connection, and the user enters IDLE state.

Further, when the data service described in step 1 is accessed, the initial access rate S _i is set according to the current base station load, and if there is no available wireless resource, the data service that has been accessed is preempted by reducing the speed; the details are as follows:

Among them, a, b, and c are the number of occupied uplink BRUs when the data service access rate is A, B, and C respectively, A>B>C, a>b>c, and satisfy when , the speed reduction preemption function is triggered.

Further, the speed reduction preemption refers to selecting a user among all users who only perform data services, and reducing the rate of the selected user to C; the selection method of the speed reduction user is as follows: the maximum number of users that the cell can accommodate is Nmax, The user number is i, i starts from 0, and the maximum effective value is Nmax-1. Traversing through all Nmax users to find the speed reduction target may have the following three situations: 1) There is a user i that satisfies S _i =A, return User number i; 2) There is no S _i =A user, and there is S _i =B user i, return user number i; 3) There is neither S _i =A user nor S _i =B user, return Nmax. If i=Nmax, it means that no user can reduce the speed to release the BRU, then reject the access; if i<Nmax, reduce the speed of user i to C.

Further, the rate adjustment described in step 3 is in

Beneficial effects of the present invention: the wireless resource self-adaptive allocation strategy of the present invention reduces resource congestion caused by small-flow data services, improves resource utilization, and effectively reduces network load caused by signaling.

The present invention allocates resources based on traffic monitoring and real-time use status of wireless resources, and comprehensively uses methods such as speed up and down and state migration, which can significantly reduce the amount of signaling, reduce resource congestion caused by small traffic data services, and also improve system resources. Utilization, improving user perception.

Description of drawings

FIG. 1 is a schematic diagram of a process of searching for a target user in the preemption function.

FIG. 2 is a schematic diagram of a signaling flow for a user transitioning from a CELL_DCH state to a CELL_PCH state.

Figure 3 is a schematic diagram of the signaling flow of the user transitioning from the CELL_PCH state to the CELL_DCH state

FIG. 4 is a schematic diagram of a signaling flow for the user to transition from the CELL_PCH state to the IDLE state.

Detailed ways

The present invention provides a strategy for self-adaptive allocation of wireless resources, which specifically includes the following steps: Step 1. When data services are accessed, the initial access rate is set according to the current base station load. Carry out deceleration preemption; Step 2, for the data service that has been accessed, carry out flow monitoring at Iu interface place (Iu interface is the interface between access network UTRAN and core network CN); Step 3, according to the result of flow monitoring, Speed up, slow down, or state transition for small-traffic services allocated dedicated physical resources; step 4, for CELL_PCH users, if there is data transmission, the state transition is performed, and if there is no data transmission for a long time, the user is released. The wireless resource self-adaptive allocation strategy of the present invention reduces resource congestion caused by small-flow data services, improves resource utilization, and effectively reduces network load caused by signaling.

The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings and specific examples.

Step 1: when wireless resources are abundant, the adaptive resource allocation scheme of the present invention will try to configure a higher bandwidth for the access data service to satisfy the user QoS (QoS (Quality of Service, Quality of Service) refers to a network that can utilize Various basic technologies provide better service capabilities for specified network communications, and are a security mechanism of the network, and are a technology used to solve problems such as network delay and congestion); when wireless resources are exhausted, the present invention The self-adaptive resource allocation scheme will trigger the preemption function when the data service is accessed, slow down the data service that occupies a high bandwidth, release the code channel, and ensure the access of other users.

The downlink adopts HSDPA (High Speed Downlink Packet Access, which is a mobile communication protocol) technology, and the bandwidth discussed here specifically refers to the uplink. The uplink rates are A, B, and C, and the corresponding number of occupied BRUs (basic resource units) are a, b, and c, A>B>C, a>b>c, and satisfy When data services are accessed, the initial access rate depends on the current available wireless resources (that is, the number of available BRUs ). Initial access rate of user i in

when , the preemption function is triggered.

The purpose of the preemption function is to select a user among all users who only perform data services, and reduce the user's rate to C. The selection of speed-down users is shown in Figure 1. The maximum number of users that can be accommodated in the cell is Nmax (the user number is i, i starts from 0, and the maximum effective value is Nmax-1). Here, it traverses all Nmax users to find the number of down-speed users. The speed target may have the following three situations: 1) There is a user i satisfying S _i =A, and the user number i is returned; 2) There is no user i with S _i =A, and there is a user i with S _i =B, and the user number i is returned; 3) There is neither S _i =A user nor S _i =B user, return Nmax. If i=Nmax, it means that no user can reduce the speed, then reject the access; if i<Nmax, reduce the speed of user i to C.

Step 2: After user i establishes a radio access bearer, start a timer with a period of T _flow , and count the number of received bits of user i at the Iu interface Then the actual rate of user i

Step 3: The present invention adjusts the number of wireless resources occupied by the user according to the actual rate of the user.

when When , the adjustment speed of user i is in

Wherein, S _i is the current service rate of user i, if S _i ′≠S _i , the rate is increased or decreased through the radio bearer reconfiguration process; if S _i ′=S _i , no processing is performed.

when , the user state is migrated to CELL_PCH, and dedicated radio resources are released. The transition signaling from the CELL_DCH state to the CELL_PCH state is shown in FIG. 2 .

Step 4: When the user enters the CELL_PCH state, start the timer T _PCHTOIDLE . If there is data transmission before the timer expires, the timer is terminated, and the user state transitions to CELL_DCH; after the timer expires, the user's Iu connection and RRC connection are released, and the user enters the IDLE state. Figure 3 describes the flow of the user transitioning from the CELL_PCH to the CELL_DCH state, and Figure 4 describes the flow of the user entering the IDLE state from the CELL_PCH.

The above is only a preferred embodiment of the present invention, it should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, some improvements and modifications can also be made. It should be regarded as the protection scope of the present invention.

Claims (1)

1. a kind of method of radio resource self-adjusted block in TDSCDMA system, which comprises the steps of:

Step 1: be arranged according to current base station load when data service accesses and be initially accessed rate, if without usable radio resources, Reduction of speed is carried out to the data service accessed to seize；Wherein, the initial access rate of user i For Currently available radio resource, i.e., the number of available BRU；

Step 2: starting a cycle after user i sets up radio access bearer is T_flowTimer, and in Iu interface The reception bit number of counting user iThe then actual speed rate of user i

Step 3: working asWhen, user i regulate the speed forS_iFor the current business speed of user i Rate, if S '_i≠S_i, then raising speed or reduction of speed are carried out by radio bearer Reconfiguration Procedure；If S '_i=S_i, then it is not processed；WhenWhen, by user status transferring to CELL_PCH, discharge dedicated radio resources；

When data service carries out speed adjust, it is based on current base station available resourcesUser's actual speed rateAnd current speed Rate S_i, it is specific as follows:

Step 4: starting timer T when user enters _ FACH state_PCHTOIDLE；There is data transmission before timer expired, eventually Only timer, user status transferring to CELL_DCH；After timer expired, the Iu connection for discharging user is connected with RRC, Yong Hujin Enter IDLE state；

When data service described in step 1 accesses, it is arranged according to current base station load and is initially accessed rate, if is provided without available wireless Source carries out reduction of speed to the data service accessed and seizes, specific as follows:

Wherein, a, b, c, which are respectively data service access rate, corresponding when being A, B, C occupies uplink BRU number, A > B > C, a > b > c, and meetWhenWhen, trigger reduction of speed preemption function；

The reduction of speed seize refer to it is all only carry out data services users in select a user, by selected user's Rate is down to C；The choosing method of reduction of speed user is as follows: it is Nmax that cell, which accommodates up to number of users, and Customs Assigned Number i, i are from 0 Start, maximum virtual value is Nmax-1, is traversed in all Nmax users, finds reduction of speed target, has following three situation: 1) In the presence of meeting S_i=party A-subscriber i returns to Customs Assigned Number i；2) S is not present_i=party A-subscriber, there are S_iThe user i of=B returns to user and compiles Number i；3) S is not present_iS is also not present in=party A-subscriber_i=party B-subscriber returns to Nmax；If i=Nmax illustrates that no user can be carried out drop Quick-release puts BRU, then refuses the secondary access；If i < Nmax, is down to C for the rate of user i.