WO2007128179A1 - A method and system for the reconfiguration of the public transmission channel - Google Patents

Abstract

A method and system for the reconfiguration of the public transmission channel are disclosed in present invention. The method includes: the radio network controller(RNC) redistributes the channel code to the public transmission channel; the RNC sends the public transmission channel reconfiguration information to the Node B, the information related to the redistributed channel code is included in the public transmission channel reconfiguration information; the Node B obtains the information related to the redistributed channel code from the public transmission channel reconfiguration information, and sets the channel code corresponding to said information related to channel code as the new channel code occupied by the public transmission channel. The problem is solved in the present invention that the channel code of the public transmission channel can not be reconfigured. The project in the present invention realizes the reconfiguration of the public transmission channel, so that the channel codes to be distributed to other channels can be released and the resource availability of the channel code in zone can be enhanced.

Description

 The present invention claims to be submitted to the Chinese Patent Office on May 10, 2006, and the application number is 200610080164. 5, and the invention name is "a method for reconfiguring a public transmission channel". Priority of the application, the entire contents of which are incorporated herein by reference.

Technical field

 The present invention relates to the field of wireless communication technologies, and more particularly to a method and system for reconfiguring a common transmission channel in Wideband Code Division Multiple Access (WCDMA).

Background technique

 In a WCDMA system, the downlink channel is distinguished by a combination of a scrambling code and a channel code.

 After a specific channel code is assigned to a user equipment, the user equipment can use the channel resources corresponding to the channel code. Since different channel codes are orthogonal, user equipment can be distinguished by assigning different channel codes to different user equipments.

 The size of the channel code of the downlink channel, that is, the spreading factor (SF) of the channel code, determines the bandwidth of the channel resources that the user equipment can use, that is, the amount of data that the user equipment can transmit in a unit time. Therefore, in a WCDMA system, it is easy to implement services of different rate requirements, such as multimedia services, in a system by allocating different channel codes for different user equipments.

 For the scrambling code of the downlink channel, each cell in the WCDMA system can simultaneously use multiple scrambling codes, including a necessary primary scrambling code and up to 15 optional secondary scrambling codes, and each scrambling code corresponds to one. The code tree of the channel code, each code tree has the same number of channel codes. Based on this setup, in theory, the channel code resources in the cell can be increased by increasing the number of scrambling codes. However, in general, considering the complexity of the system and mutual interference between channels, most cells use only one scrambling code, the primary scrambling code. Obviously this makes the channel code resources in the cell relatively limited. Thus, in a WCDMA system, how to effectively use and allocate limited channel code resources becomes a key issue in radio resource management. The channel code resource allocation is good, and the corresponding resource utilization rate is high. In the same situation, the system can access more user equipment, especially when other resources are not restricted.

In the fifth version of WOMA technology, the important feature of High Speed Downlink Packet Access (HSDPA, Hi gh Speed Down Ink Packet Acces s) was introduced. HSDPA implements high-speed downlink data transmission through key technologies such as adaptive modulation and coding (AMC), hybrid retransmission (HARQ), and fast scheduling of base stations. Lose.

 After the introduction of HSDPA, three channels are added correspondingly, namely, a high-speed physical downlink shared channel (HS-PDSCH) for transmitting downlink information information, a high-speed shared control channel (HS-SCCH) for transmitting downlink control information, and A high-speed dedicated physical control channel (HS-DPCCH) that transmits uplink feedback information.

 For the HS-PDSCH channel, up to 15 HS-PDSCH channels can be used by one cell, and the SF of the channel code used by the HS-PDSCH channel is fixed at 16. The channel code assigned to the HS-PDSCH is assigned by the Network Controller (RNC) and the channel code assigned to the HS-PDSCH must be consecutive.

 Figure 1 shows an allocation scheme for HSDPA-based channel codes. Figure 1 shows the assignment of the four rightmost channel codes with an SF of 16 to the HS-PDSCH channel, the code numbers of which are 12, 13, 14, and 15. Other channel codes other than this can be assigned to a common transmission channel for transmitting broadcast traffic and a dedicated channel for transmitting real-time traffic.

 HSDPA generally carries bursty data services. Therefore, there may be more data services in a certain period of time. In view of this situation, in the communication process, the RNC can perform real-time services based on the dedicated channels in the cell. And the demand situation of the data service carried on the HS-PDSCH channel, and the number of channel codes allocated to the HS-PDSCH channel is reasonably adjusted to meet the transmission of the bursty high data service. For example, when the data service demand in the cell is high and the real-time service is small, the RNC may allocate a fifth channel code adjacent to the allocated four channel codes to the HS-PDSCH, and the code number of the fifth channel code is adjusted. For 11, the SF is still 16.

 Of course, in the above adjustment, the channel code added by the RNC to the HS-PDSCH must be in an idle state, that is, the channel code or the subcode under the code is not allocated to any channel. If the dedicated channel is using the subcode under the channel code, the RNC is required to assign another channel code to the channel to make the channel code idle.

For example, at a certain moment, a user equipment for voice communication uses the channel code of the channel code with the SF of 128 and the code number of 95 in FIG. 1, and the channel code of the channel code number of the SF is 16, and the code number is 11. Only the one subcode is occupied by the voice user equipment, the RNC may reassign the channel code of the other code number to the channel corresponding to the user equipment, for example, assign the channel code with the SF of 128 and the code number of 4 to the channel code. User equipment. Thus, the subcodes under the channel code of SF 16 and code number 11 are all idle. Thus, when the demand for data services increases, the RNC can set the SF to 16 and the code number to 11 The channel code is assigned to the HS-PDSCH channel.

 However, channel redistribution is currently only implemented for dedicated channels, but in fact not only the dedicated channel may occupy the channel code that needs to be allocated to the HS-PDSCH channel, but the common transmission channel may also occupy the channel code in the channel code and its branches. In some special cases, it may also occur that the common transport channel and the dedicated channel occupy the channel code that needs to be allocated to the HS-PDSCH channel. In these cases, the current method cannot allocate more channel codes to the HS-PDSCH channel when needed, which reduces the channel code resource utilization. In addition, there are some other situations where the channel code resources need to be optimally allocated. Since the channel code reconfiguration cannot be performed on the common transmission channel at present, this may result in a reasonable optimal allocation of channel code resources.

Summary of the invention

 It is an object of embodiments of the present invention to provide a method and system for reconfiguring a common transport channel, reconfiguring a channel code for a common transport channel.

 To solve the above problem, the embodiment of the present invention provides the following technical solutions:

 A method of reconfiguring a common transport channel, the method comprising the steps of:

 The radio network controller RNC reallocates the channel code for the common transport channel;

 Sending, by the RNC, a common transport channel reconfiguration message to the base station NodeB, where the common transport channel reconfiguration message carries related information of the reassigned channel code;

 And the NodeB obtains related information of the reassigned channel code from the common transport channel reconfiguration message, and uses a channel code corresponding to the channel code related information as a channel code newly occupied by the common transport channel.

 Correspondingly, a radio network controller is provided, including a channel code allocator and a message configurator, wherein

 The channel code allocator is configured to reallocate a channel code for a common transport channel, and send related information of the reassigned channel code to the message configurator;

 The message configurator is configured to send the common transport channel reconfiguration message to the base station NodeB after the related information of the reassigned channel code is carried in the common transport channel reconfiguration message.

 A base station is further provided, including a channel code reader and a controller, wherein

The channel code reader is configured to receive a common transport channel reconfiguration message, obtain relevant information of the reassigned channel code, and send the related information of the reassigned channel code to the control. The controller confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code.

 Further, a system for reconfiguring a common transmission channel is provided, including a radio network controller and a base station, the radio network controller including a channel code allocator and a message configurator, the base station including a channel code reader and a controller , among them

 The channel code allocator is configured to reallocate a channel code for a common transport channel, and send related information of the reassigned channel code to the message configurator;

 The message configurator is configured to: after the related information of the reassigned channel code is carried in the common transport channel reconfiguration message, send the common transport channel reconfiguration message to the channel code reader; The device is configured to receive a common transport channel reconfiguration message, obtain relevant information of the reassigned channel code, and send related information of the reassigned channel code to the controller;

 And the controller confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code.

 The solution of the embodiment of the present invention adds related information of the reconfigured channel code in the common transport channel reconfiguration message, and initiates a reconfiguration process of the common transport channel by the RNC when needed, thereby enabling certain needs to be allocated to The channel codes of other channels except the common transmission channel are idle, which provides an effective way to improve the utilization of channel code resources in the cell.

 For the HS-PDSCH channel, when the data service demand in the cell increases, the channel code immediately adjacent to the channel code occupied by the HS-PDSCH channel can be freed by the scheme of the embodiment of the present invention, thereby improving the HS-PDSCH channel. The number of channel codes that can be used increases the cell HSDPA throughput rate and also improves the channel code resource utilization efficiency of the cell.

DRAWINGS

 1 is a schematic diagram of a channel code allocation scheme in the prior art;

 1 is a flowchart of an implementation of a method for reconfiguring a common transport channel in a specific embodiment of the present invention; FIG. 3 is a schematic diagram of a channel code allocation scheme according to an embodiment of the present invention;

 4 is a schematic diagram of another channel code allocation scheme in a specific embodiment of the present invention;

FIG. 5 is a schematic structural diagram of an RNC according to an embodiment of the present invention; 6 is a schematic structural diagram of a NodeB according to an embodiment of the present invention;

 FIG. 7 is a schematic structural diagram of a reconfiguration common transmission channel system in an embodiment of the present invention.

detailed description

 Currently, the network can reconfigure the established public transport channel, specifically through the common transport channel reconfiguration message (COMMON TRANSPORT CHANNEL RECONFIGURATION). The main content of this message is shown in Table 1.

 It can be seen from Table 1 below that for the established common transport channel, only the power information can be reconfigured by the RNC at present, that is, the RNC can only adjust the transmit power of these channels.

表 1

Table 1

In view of the above, the solution of the present invention first carries the relevant parameters of the reassigned channel code in the common transport channel reconfiguration message shown in Table 1. In this embodiment, by adding reconfiguration in the common transport channel reconfiguration message. The channel code information parameter is implemented in a manner, and the channel code information parameter may specifically include a size of a spreading factor and a code number of the channel code. The content of the added message is shown in Table 2. Record name range

 Message Type Integer (0..255)

 Common transport channel reconfiguration information

 >SCCJPCH channel parameters

 »FACH channel

 》>Transport Channel Number 0 - 255

 >»Maximum FACH channel transmit power -35.0— +15.0 dB

 »>Time window parameter 0..1279 ms

 »PCH channel ^ 3⁄4

 >》Transport Channel Number 0 - 255

 »>Maximum PCH channel transmit power -35.0 - +15.0 dB

 >»Time window parameter 0..1279 ms

 »PICH channel

 >»Transport Channel Number 0 - 255

 »>PICH channel power -35.0 - +15.0 dB

 »Reconfigured channel code information

 >» Spreading factor size 4 ~ 256

 >》Channel Code Number 0 - 255

Table 2

 The common transport channel can then be reconfigured as needed. Since the channel code currently occupied by the common transmission channel can be the same reconfiguration processing scheme regardless of which channel other than the common transmission channel needs or may need to use the channel code, the following specific The channel code currently occupied by the common transmission channel is an example of a relevant channel code of a channel code that can be allocated to the HS-PDSCH channel. The channel code occupied by the common transport channel, that is, the relevant channel code, may be exactly the channel code itself that can be allocated to the HS-PDSCH channel, or may be the parent code or subcode of the channel code. Regardless of which of the associated channel codes, reconfiguration can be performed in accordance with the processing scheme of the present invention.

Specifically, based on the common transport channel reconfiguration message shown in Table 2, if the RNC determines that the channel code currently occupied by the common transport channel is the relevant channel code of the channel code currently assignable to the .HS-PDSCH channel, The channel code itself assigned to the HS-PDSCH channel, or the parent code or subcode of the channel code, ensures that the allocation can be made immediately when the channel code needs to be allocated for the HS-PDSCH, and the RNC can initiate the weight of the common transmission channel. The configuration process, as shown in Figure 2, includes the following steps: PT/CN2006/003608 a 7—

 Step 201: The RNC re-allocates the channel code for the common transport channel, sends a common transport channel reconfiguration message to the base station (NodeB), and adds a channel code reconfigured to the common transport channel in the reconfigured channel code information parameter of the message. Information.

 Step 202: After receiving the message, the NodeB obtains channel code information in a channel code information parameter of the message, and uses a channel code corresponding to the channel code related information as a channel code newly occupied by the common transmission channel, thereby The channel code corresponding to the channel code information may be used to transmit a signal for the common transmission channel.

 In step 202, the NodeB may also reply an acknowledgement message to the RNC, and after receiving the acknowledgement message sent by the NodeB, the RNC determines that the channel code originally occupied by the common transport channel is in an idle state.

 Through the above reconfiguration process, the channel code originally occupied by the common transmission channel can be freed. The RNC can allocate the channel code required to be allocated to the HS-PDSCH channel to the HS-PDSCH through a physical shared channel reconfiguration message (physical space re-report).

 Of course, the RNC may also perform the processing shown in FIG. 2 after determining that it is necessary to add a channel code to the HS-PDSCH channel, and the subcode of the channel code currently required to be allocated to the HS-PDSCH is occupied by the common transmission channel.

The solution of the present invention can be applied to the allocation scheme shown in FIG. 3. At a certain time, the network allocates a common transport channel for a broadcast service, and the channel uses a channel code with a spreading factor of 64 and a code number of 42. The HS-DPSCH channel occupies 5 channel codes with a spreading factor of 16 and a code number of 11 to 15, and the remaining sub-codes below the channel code with a spreading factor of 16 and a code number of 10 are not occupied. As can be seen from FIG. 3, the channel code having a spreading factor of 64 and a code number of 42 is a subcode of a channel code having a spreading factor of 16 and a code number of 10. In this case, the common transmission channel is Before reallocating other channel codes, a channel code with a spreading factor of 16 and a code number of 10 cannot be allocated to the HS-PDSCH channel, even if the channel code with a spreading factor of 16 and a code number smaller than 10 is idle. status'. For the above situation, if the subcodes of the channel codes with the spreading factor of 16 and the code number of 0 are all in the idle state, the channel code of the common transport channel can be reconfigured by using the solution of the present invention. For example, A channel code having a spreading factor of 64 and a code number of 3 is reconfigured to the common transmission channel, so that a channel code having a spreading factor of 64 and a code number of 42 is in an idle state, thereby making a spreading factor of 16, a code number. The channel code of 10 is in an idle state. After that, the spreading factor is 16 and the channel code of code number 10 can be Configure for use on the HS-PDSCH channel.

 Obviously, if the RNC needs to increase the channel code allocated to the HS-PDSCH to be simultaneously occupied by the common transport channel and the dedicated channel, the RNC may initiate a reconfiguration process of the common transport channel and the dedicated channel, after the reconfiguration is completed, the common transport channel The channel code originally occupied is in an idle state, so the channel code with a spreading factor of 16 corresponding to the channel code is allocated to the HS-PDSCH channel.

 Specifically, it is assumed that there are two common transmission channels at a certain time, and channel codes with a spreading factor of 64, code numbers of 40 and 41, and a dedicated channel using a spreading factor of 128 and a code number are used. The channel code of 87, as shown in FIG. 4, is a subcode under a channel code with a spreading factor of 16 and a code number of 10, in order to channel a spreading factor of 16 and a code number of 10. If the code is idle, the scheme of the present invention can be used to reconfigure the channel code for the two common transport channels, and the channel code is reconfigured for the dedicated channel according to the existing scheme. For example, the spreading factor can be 32 and the code number is 2. And the channel code of 3 and 3 are reconfigured to the common transmission channel, and the channel code with the spreading factor of 128 and the code number of 3 is reconfigured to the dedicated channel, thereby ensuring that the channel code with the spreading factor of 16 and the code number of 10 is idle. status.

 The common transport channels in Figures 3 and 4 above occupy the subcodes of the channel codes that need to be allocated to the HS-PDSCH channel. Obviously, if the channel code itself is occupied, the channel code is directly released after reconfiguration; if the parent code of the channel code is occupied, the channel code is also released after reconfiguration.

 Correspondingly, referring to FIG. 5, a radio network controller is provided, including a channel code distributor 11 and a message configurator 12, wherein

 The channel code allocator 11 is configured to re-allocate a channel code for a common transport channel, and send information about the re-assigned channel code to the message configurator 2;

 The message configurator 12 is configured to send the common transport channel reconfiguration message to the base station NodeB after carrying the related information of the reassigned channel code in the common transport channel reconfiguration message.

 Referring to FIG. 6, a base station is provided, including a channel code reader 21 and a controller 22, wherein the channel code reader 21 is configured to receive a common transport channel reconfiguration message, and obtain a correlation of the reassigned channel code therefrom. After the information, the information about the reassigned channel code is sent to the controller 22;

The controller 22 confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code. Further, referring to FIG. 7, a system for reconfiguring a common transport channel, including a radio network controller 1 and a base station 2, the radio grid controller 1 includes a channel code allocator 11 and a message configurator 12, The base station 1 includes a channel code reader 21 and a controller 22, wherein

 The channel code allocator 11 is configured to re-allocate a channel code for a common transport channel, and send information about the re-assigned channel code to the message configurator 2;

 The message configurator 12 is configured to send the common transport channel reconfiguration message to the channel code reader 21 after the related information of the reassigned channel code is carried in the common transport channel reconfiguration message;

 The channel code reader 21 is configured to receive a common transport channel reconfiguration message, obtain relevant information of the reassigned channel code, and send the related information of the reassigned channel code to the controller 22;

 The controller 22 confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code. '

 The above description is only a preferred embodiment of the solution of the present invention and is not intended to limit the scope of protection of the present invention.

Claims

Rights request  A method for reconfiguring a common transport channel, the method comprising the steps of: the radio network controller RNC reallocating a channel code for a common transport channel;  The RNC sends a common transport channel reconfiguration message to the base station odeB, where the common transport channel reconfiguration message carries related information of the reassigned channel code;  And the NodeB obtains related information of the reassigned channel code from the common transport channel reconfiguration message, and uses a channel code corresponding to the channel code related information as a channel code newly occupied by the common transport channel.  The method according to claim 1, wherein the step of the RNC reassigning the channel code for the common transport channel further comprises the step of: determining that the channel code currently occupied by the common transport channel is assignable to the public The associated channel code of the channel code of the other channel than the transmission channel.  The method according to claim 1, wherein the step of the RNC reassigning the channel code for the common transport channel further comprises the step of: determining that the channel needs to be allocated for other channels than the common transport channel. The code, and the channel code currently occupied by the common transmission channel is the relevant channel code of the channel code currently required to be allocated to the other channel.  The method according to claim 2 or 3, wherein the channel code of the channel code includes at least the channel code itself, a parent code of the channel code, and a subcode of the channel code. The method according to claim 2 or 3, wherein the other channel comprises a high speed physical downlink shared channel HS-PDSCH.  The method according to claim 1, wherein the step of the RNC transmitting the common transport channel reconfiguration message to the base station NodeB further includes:  The NodeB returns a confirmation message to the MC;  After receiving the acknowledgement message, the RNC determines that the channel code originally occupied by the common transport channel is in an idle state.  7. The method according to claim 1, wherein: the information about the reassigned channel code is carried on a spreading factor and a code number of the channel code. A radio network controller, comprising: a channel code allocator (11) and a message configurator (12), wherein The channel code allocator (11) is configured to reallocate a channel code for a common transport channel, and send related information of the reassigned channel code to the message configurator (2);  The message configurator (12) is configured to send the common transport channel reconfiguration message to the base station NodeB after carrying the related information of the reassigned channel code in the common transport channel reconfiguration message.  A base station, comprising: a channel code reader (21) and a controller (22), wherein  The channel code reader (21) is configured to receive a common transport channel reconfiguration message, obtain relevant information of the reassigned channel code, and send related information of the reassigned channel code to the controller ( twenty two );  The controller (22) confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code.  10. A system for reconfiguring a common transport channel, characterized by: comprising a radio network controller (1) and a base station (2), the radio network controller (1) comprising a channel code distributor (11) and a message configurator (12), the base station (2) comprising a channel code reader (21) and Controller (2 ² ), where  The channel code allocator (11) is configured to re-allocate a channel code for a common transport channel, and send related information of the re-assigned channel code to the message configurator (2);  The message configurator (12) is configured to: after the related information of the reassigned channel code is carried in the common transport channel reconfiguration message, send the common transport channel reconfiguration message to the channel code reader (21) ;  The channel code reader (21) is configured to receive a common transport channel reconfiguration message, obtain relevant information of the reassigned channel code, and send related information of the reassigned channel code to the controller ( twenty two );  The controller (11) confirms the corresponding channel code as the channel code newly occupied by the common transmission channel according to the received related information of the reassigned channel code.