[0031] The core idea and preferred embodiments of the present invention will be further described and illustrated in detail below in conjunction with the accompanying drawings.
[0032] The present invention provides a dynamic scheduling method of carrier resources in a TD-SCDMA multi-carrier HSDPA system. The core idea is: in a cell of the TD-SCDMA multi-carrier HSDPA system, when the high-speed shared resources change, the NodeB initiates During the radio link update process and provide relevant carrier frequency indication information, the RNC is required to perform radio link reconfiguration, so as to reconfigure the UE to an appropriate carrier frequency.
[0033] Figure 1 is a flowchart of the steps described in the method of the present invention. As shown in Figure 1, the method includes the following two steps:
[0034]Step 1: When the high-speed shared resource changes, the NodeB sends a radio link parameter update indication message to its own RNC to trigger the radio link parameter update process, where the radio link parameter update indication message includes information for indicating whether the RNC is The carrier frequency of the UE currently carrying the high-speed shared channel needs to be replaced with the information unit of the new frequency point;
[0035] In the multi-carrier HSDPA system, the physical channel scheduling between UEs is done in the NodeB. When the radio link is established, the RNC will set the UE’s guaranteed rate band during the radio link establishment (or radio link reconfiguration) process. For the NodeB, the NodeB will try to ensure that the UE reaches its guaranteed rate when scheduling air interface resources. However, when the air interface quality deteriorates rapidly or multiple users are simultaneously transmitting at a high rate, the NodeB may not be able to guarantee that all UEs reach their guaranteed rate. At this time, if some UEs are not moved to other carriers that can meet the guaranteed rate requirements in time, On the frequency, it will cause the transmission rate of all UEs to drop. In addition, there may be cases such as that Node B needs to forcibly switch the working carrier frequencies of certain UEs according to the unified scheduling of all carrier frequencies of the entire cell, or Node B decides that users with higher priority on the working carrier frequency of the original UE need to be switched. The working carrier frequency of the original UE causes changes in high-speed shared resources. Therefore, in view of the above situation, when the high-speed shared resource changes, the NodeB will send a radio link parameter update instruction message to its own RNC to trigger the radio link parameter update process. The radio link parameter update instruction message contains instructions for indicating the RNC. Whether it is necessary to change the carrier frequency of the UE currently carrying the high-speed shared channel to the information unit of the new frequency point. At the same time, the information unit may include the switching carrier frequency information recommended by the NodeB to the RNC, which is used to instruct the RNC to change the carrier frequency of the UE currently carrying the high-speed shared channel to the recommended switching carrier frequency; or it may only include There is a need to change the UE from the current carrier frequency carrying the high-speed shared channel to the new carrier frequency, but it does not include the specific switching carrier frequency information recommended by the NodeB to the RNC.
[0036] More specifically, take the case where NodeB cannot meet the UE's guaranteed rate requirement as an example: on the network side, a MAC-hs entity is created in Node B to manage the physical channel resources in the HSDPA system. When Node B is performing resource scheduling At this time, the MAC-hs entity can allocate resources for the UE according to the HSDPA capability information and resource scheduling requirements of the UE. When the MAC-hs finds that it has been unable to meet the guaranteed rate requirement of the UE for a continuous period of time (the length of time can be configured) during scheduling, the MAC-hs entity informs the NodeB to initiate a radio link parameter update process to indicate that the carrier frequency needs to be changed. At the same time, the recommended carrier frequency is selected from other carrier frequencies in the cell that has a lighter load and can meet the requirements of the guaranteed rate as the recommended carrier frequency and reported to the upper layer in the NodeB. The NodeB immediately initiates a radio link update process, and initiates a radio link update instruction message to the RNC, requesting the RNC to change the carrier frequency currently used by the UE, and at the same time give the recommended carrier frequency information in the message.
[0037] Step 2: The RNC configures the carrier frequency carried by the high-speed shared channel of the UE according to the indication of the information element contained in the received radio link parameter update indication message.
[0038] After receiving the radio link parameter update indication message sent by the Node B, the RNC initiates the radio link reconfiguration process according to the indication of the information contained in the information unit, and reconfigures the carrier frequency carried by the UE's high-speed shared channel. There are two situations as follows:
[0039] (1) If the information element contains the frequency information of the switching carrier frequency recommended by the NodeB to the RNC, the RNC configures the dedicated resources of the UE to the frequency recommended by the NodeB. The specific process is: NodeB in the radio link reconfiguration process Allocate the corresponding HS-SCCH and HS-SICH channel resources for the user on the carrier frequency, and use these messages as a response to feedback to the RNC during the radio link reconfiguration process. After the RNC receives the feedback message, it instructs the NodeB to activate The new configuration completes the reconfiguration process of the wireless link. After receiving the HSDPA resource configuration information related to the UE from the NodeB, the RNC sends the information to the UE through the transport channel reconfiguration process (transport channel reconfiguration) and the physical channel reconfiguration process (physical channel reconfiguration) in the RRC protocol. Reconfigure to the carrier frequency recommended by NodeB. At this time, RNC can also use its own algorithm (the more common algorithms include: selecting the frequency with a relatively small number of current users, selecting the frequency with the smallest sum of guaranteed rates, selecting the frequency with the least interference, etc.), through the entire cell To determine the usage of the carrier frequency, configure the UE to a carrier frequency or cell deemed appropriate by the RNC, or not to switch the carrier frequency of the high-speed shared channel currently carrying the UE.
[0040] (2) If the information element contains instructions to change the UE from the current carrier frequency carrying the high-speed shared channel to the new carrier frequency, but does not include the specific switching carrier frequency information recommended by the NodeB to the RNC, the same According to its own algorithm, the RNC can also configure the UE to a carrier frequency or cell deemed appropriate by the RNC by judging the carrier frequency usage of the entire cell, or not switch the carrier frequency of the high-speed shared channel currently carrying the UE.
[0041] Figure 2 is a schematic diagram of a message exchange process in a specific embodiment of the present invention. The method of the present invention will be described in detail below with reference to FIG. 2 through a specific embodiment. as shown in picture 2:
[0042] In the TD-SCDMA multi-carrier HSDPA system, when the high-speed shared resource changes, the NodeB cannot guarantee that all UEs reach its guaranteed rate. If some users are not relocated in time, the transmission rate of all users will decrease. The protocol standard message exchange process involved in the method for carrier frequency resource scheduling is as follows:
[0043] Step A: NodeB sends a radio link parameter update indication message (Radio LinkParameter Update Indication) to its own RNC, triggers the radio link parameter update process, and indicates in the message that the carrier frequency needs to be changed and carries recommended carrier frequency information;
[0044] Step B: After receiving the radio link parameter update indication message, the RNC sends a radio link reconfiguration prepare message (Radio Link Reconfiguration Prepare) to the NodeB, and allocates the dedicated resources of the UE on the carrier frequency recommended by the NodeB;
[0045] Step C: After receiving the radio link reconfiguration ready message, the NodeB sends a radio link reconfiguration ready message (Radio Link Reconfiguration Ready) to the RNC, and the radio link reconfiguration ready message carries a message for the UE in the corresponding HS-SCCH and HS-SICH channel resources allocated on the carrier frequency;
[0046] Step D: After receiving the radio link reconfiguration ready message, the RNC sends a radio link reconfiguration execution message (Radio Link Reconfiguration Commit) to the NodeB, instructing the NodeB to activate the new configuration after the radio link reconfiguration activation time arrives;
[0047] Among them, the radio link reconfiguration activation time is specifically represented by the connection frame number (CFN, Connection Frame Number). After the NodeB receives the radio link reconfiguration execution message, it will start a new configuration stop when the CFN is reached for the first time. Use the old configuration.
[0048] Step E: The RNC sends a physical channel reconfiguration message (PhysicalChannel Reconfiguration) or a transport channel reconfiguration message (Transport ChannelReconfiguration) to the UE to notify the UE to reconfigure the physical channel, and configure the UE to the NodeB recommended carrier frequency;
[0049] Step F: The UE returns a physical channel reconfiguration complete message (Physical Channel Reconfiguration Complete) or a transport channel reconfiguration complete message (TransportChannel Reconfiguration Complete) to the RNC, and the process ends.
[0050] Through the above-mentioned dynamic scheduling method, the network side can dynamically schedule the HSDPA carrier resources used by each UE, thereby achieving carrier load balancing, effectively utilizing air interface resources, and improving system capacity.
[0051] It should be understood that the above description of specific embodiments is more detailed and should not be considered as a limitation to the scope of patent protection of the present invention. The scope of patent protection of the present invention shall be subject to the appended claims.
