CN1108710C - Radio channels distribution method - Google Patents

Abstract

The invention discloses a method for allocating wireless channels in a wireless communication system based on multi-time slots, comprising the following steps: setting a transmitter/receiver (TRX) to work in a time slot frequency hopping mode; Each dedicated wireless channel of the 8 ^* N uplink/downlink channels of TRX) is regarded as a set as a whole. When wireless channel resource allocation is performed, wireless channels with different time slot numbers are taken out with the channel set as a unit, regardless of Which transmitter/receiver (TRX) these time slots are on; the frequency hopping parameters of the wireless channels with different time slot numbers taken out are adjusted to be the same. By applying the method of the invention, the multi-slot capability of the mobile station can be more fully used, and the service of the mobile communication is faster and the service quality is higher.

Description

A kind of wireless channel allocation method

technical field

The invention relates to a method for allocating wireless resources in the field of mobile communication, in particular to a method for selecting and allocating wireless channels in a multi-slot mobile communication system.

Background technique

Data communication technology and mobile communication technology are two very active directions in the field of information technology today. Wireless data service is a combination of data communication technology and mobile communication technology. The support for IP and high-speed data service has become the evolution of the second generation mobile communication system. direction. GPRS (General Packet Radio Service: General Packet Radio Service) is a data service based on packet switching provided by GSM Phase 2+. It is a system that implements packet transmission mode on PLMN (Public Land Mobile Network: Public Land Mobile Network). GPRS will provide people with services such as Internet access, e-commerce, sending and receiving Email, automotive electronics, and so on.

GPRS completes the packet transmission function by adding a series of functional entities on the basis of the original GSM network. It retains the division of the wireless subsystem (BSS) and the network subsystem (NSS). For the network subsystem, GPRS adds SGSN (Serving GPRS Support Node) and GGSN (Gateway GPRS Support Node) two functional entities, for the wireless subsystem, it is common to the GSM circuit switching service, that is, the BSS subsystem supports packet transmission while originally supporting circuit switching.

In the wireless subsystem, a wireless channel type PDCH (packet data logical channel) is added, which is mainly used for the transmission of GPRS packet data and signaling. Specifically, there are logical channel types such as PBCCH (Packet Broadcast Control Channel), PCCCH (Packet Common Control Channel), PDTCH (Packet Data Traffic Channel), PACCH (Packet Associated Control Channel), PTCCH/D and PTCCH/U , independent allocation of uplink and downlink wireless channels. When there is data transmission, a temporary block flow (TBF: Temporary Block Flow) needs to be established. TBF is the one-way transmission of LLC PDU (Logical Link Control Packet Data Unit) between two radio resource management entities (RR). A physical connection composed of PDCHs can be composed of one or more PDCHs, and will be released when the transmission service ends. Each TBF has an identifier TFI (Temporary flow identity), which is given by the network side. For the mobile station, the TFI is currently unique, and the uplink and downlink are the same.

On the other hand, the multislot capability of the mobile station is different and there are 29 categories in total. Whether it is a data transmission service initiated by the network side or the mobile station, the network side must allocate wireless channels according to the current wireless channel resource status and the multi-slot capability of the mobile station, and establish a downlink or uplink data link.

When the network side allocates wireless resources, it can be divided into two levels. First, one or more channels are selected, and then wireless data blocks (BLOCK) are allocated on them. In the GPRS system, a common method is to use one transmitter/receiver (TRX) as a unit, and all PDCHs of each TBF are on one TRX. In this way, the wireless channel resources and the multi-slot capability of the mobile station are often not optimally utilized in practice. For example, a certain mobile phone user applies to establish a downlink TBF at present, and the multi-slot capability of the mobile phone is capable of receiving 8 time slots, but currently there is no PDCH with 8 time slots available on each TRX in the cell. Then only the PDCH with less than 8 time slots can be allocated to the mobile phone. On the one hand, the wireless channel resources are idle, and on the other hand, the multi-slot capability of the mobile phone is not fully utilized, thereby prolonging the transmission time and reducing the service quality.

Contents of the invention

In view of this, the purpose of the present invention is to provide a method for selecting and allocating wireless channels in a wireless communication system based on multi-time slots, which can break through the frame restrictions on wireless channel allocation in the prior art, thereby more flexibly performing wireless channel allocation. Resource allocation, making full use of the multi-slot capability of the mobile station, thereby providing faster and higher-quality services.

The purpose of the present invention is achieved through the following technical solutions:

A method for allocating wireless channels in a wireless communication system based on multiple time slots, comprising the following steps:

Set the transmitter/receiver (TRX) to work in the time slot frequency hopping mode;

The network side regards the dedicated wireless channels of the 8*N uplink/downlink channels of N transmitter/receivers (TRX) as a whole as a set. Radio channels with slot numbers regardless of which Transmitter/Receiver (TRX) these slots are on;

The frequency hopping parameters of the extracted wireless channels with different time slot numbers are adjusted to be the same.

According to the above-mentioned technical scheme, in the GPRS system, the assignment to the packet data logical channel (PDCH) may include the following steps:

Set the transmitter/receiver (TRX) to work in the time slot frequency hopping mode;

The network side regards all packet data logical channels (PDCHs) of the 8*N uplink/downlink channels of N transmitter/receivers (TRX) as a set, and when performing radio channel resource allocation, use the packet data logical channels ( PDCH) set as a unit, take out the packet data logical channel (PDCH) with different slot numbers, regardless of which transmitter/receiver (TRX) these slots are on;

The frequency hopping parameters of the packet data logical channels (PDCH) with different slot numbers are adjusted to be the same.

A set of identifier (TFI) values are used when establishing TBFs on channels in the above-mentioned packet data logic channel (PDCH) set.

The aforementioned N is less than or equal to the actual number of carrier frequencies of the cell.

The present invention breaks through the limitation in the prior art that wireless channel allocation is based on a transmitter/receiver (TRX) as a unit, and considers all wireless channels of all assignable time slots of different transmitter/receivers (TRX) as a set, thereby The multi-slot capability of the mobile station can be more fully utilized. This dynamic wireless channel resource allocation method can make mobile communication services faster and with higher service quality.

Detailed ways

The present invention will be further described in detail below in conjunction with specific embodiments.

Taking the GPRS system as an example, since the allocation strategy is the same for uplink and downlink, only the following lines will be described below.

When the network side allocates wireless channel resources, it does not take the 8 channels of one TRX as the range, but takes all the PDCHs of the 8*N downlink channels of N TRXs as the consideration range, where 1≤N≤CELL_TRX_NUMBER, CELL_TRX_NUMBER is the cell’s Actual carrier frequency. The meaning of "consideration range" here is:

1) Use a set of TFI value sets when establishing TBF on these resources;

2) For these PDCHs, it is not necessary to distinguish which TRX they are on.

For example, N=3, to assign a channel to a transmission, the multi-slot capability of the mobile phone is to receive 8 time slots at the same time. The current wireless channel resource status is: only time slots 6 and 7 are available for allocation on the first TRX, and only four time slots, 2, 3, 4, and 5, are available for allocation on the second TRX. There are slots 0 and 1 available for allocation on the three TRXs. Then the network side can allocate time slots 6 and 7 from the first TRX, allocate time slots 2, 3, 4, and 5 from the second TRX, and allocate time slots 0 and 1 to the mobile station from the third TRX ( MS), thereby flexibly maximizing the use of the multi-slot capability of the mobile phone and transmitting data services more quickly.

The premise of using this allocation strategy is that the base transceiver station (BTS) supports time slot frequency hopping. When allocating channels, the network side needs to adjust the frequency hopping parameters of these channels to be the same, so as to meet the requirements of mobile phones. Specific steps are as follows:

1. Set TRX to work in time slot frequency hopping mode;

2. Establish a channel resource information pool, and each PDCH is marked with (TRX number, time slot number, frequency hopping parameter, TSC);

3. According to the configuration and service statistics of the current cell, dynamically select the N value to obtain a PDCH set, and the subsequent allocation will be based on this set;

4. When it is necessary to allocate wireless channel resources, take out PDCHs with different slot numbers from the set, regardless of which TRX these slots are on, and allocate them to the mobile phone. When allocating multiple slots, as long as the slot numbers are different Yes, and adjust the frequency hopping parameters and TSC of different time slots to be the same. When adjusting, it should be noted that there cannot be two PDCHs with the same time slot number and frequency hopping parameters.

5. Allocate the BLOCK on the channel.

Above, only the GPRS system is taken as an example to illustrate the technical solution of the present invention. Obviously, this dynamic optimal allocation method for wireless channel resources can be applied to GRPS systems and any other multi-slot fields (such as HSCSD), and the application of this extension and change should be included in the protection of this patent.

Claims (4)

1. A method for allocating wireless channels in a wireless communication system based on multiple time slots, characterized in that the method comprises the following steps: Set the transmitter/receiver (TRX) to work in the time slot frequency hopping mode; The network side regards the dedicated wireless channels of the 8*N uplink/downlink channels of N TRXs as a whole, and when allocating wireless channel resources, take the channel set as a unit to take out wireless channels with different time slot numbers , regardless of which TRX these time slots are on; The frequency hopping parameters of the extracted wireless channels with different time slot numbers are adjusted to be the same. 2. The wireless channel allocation method according to claim 1, characterized in that said multi-slot based wireless communication system is a GPRS system, and said wireless channel is a packet data logical channel (PDCH). 3. The wireless channel allocation method according to claim 1 or 2, characterized in that: Where N is less than or equal to the actual number of carrier frequencies of the cell. 4. The wireless channel allocation method according to claim 2, further comprising: When establishing a Temporary Block Flow (TBF) on the channels in the PDCH set, a set of identifier (TFI) values are used.