TW201316720A - Method of handling measurement reporting and related communication device - Google Patents

Abstract

A method of handling measurement reporting for a network in a wireless communication system is disclosed. The network includes a active set for storing at least a cell identity which is capable of providing a service to a mobile device of the wireless communication system. The method includes receiving a measurement report message from the mobile device, wherein the measurement report message is used for a cell replacement procedure and includes a first cell identity corresponding to a first cell, determining whether the first cell identity is included in the active set and whether a number of the cell identity in the active set exceeds a threshold, to generate a result, and performing the cell replacement procedure according to the result.

Description

Method for processing measurement return program and related communication device

The present invention relates to a method for a wireless communication system and a communication device thereof, and more particularly to a method and a related communication device for processing a measurement report program in a wireless communication system.

The Universal Mobile Telecommunications System (UMTS) is the third generation of mobile communication technology. The Universal Terrestrial Radio Access Network (UTRAN) includes a core network consisting of a plurality of base stations (Node Bs) and a plurality of base station controllers (or wireless network controllers). Radio network controllers (RNCs).

In order to maintain communication quality, the UE performs a measurement procedure to measure the strength of the wireless signal or the Signal Noise Ratio. Before the user conducts the measurement procedure, the universal terrestrial global wireless access network first transmits a measurement control message to a user equipment. The measurement control message includes a "measurement type" field that defines the measurement type that the universal terrestrial global radio access network requires at the user end (eg, internal band measurement (intra) -frequency measurement)).

On the other hand, the measurement results of the client are transmitted to the universal terrestrial global wireless access network by means of a measurement report message. It is worth noting that through the "Measurement Return Standard" field in the measurement control message, the Universal Terrestrial Global Radio Access Network indicates which events the user will trigger the measurement return. For example, when the UE measures the signal strength or signal-to-noise ratio on a major common pilot channel (CPICH) of one of the cells that is not in the active set, it is better than one cell in the active set. When a primary shared pilot channel is used, the client will report the measurement results. The above situation is defined as a type 1c event and the trigger condition of the type 1c event is such that the number of cells in the active set is greater than or equal to a replacement activation threshold, wherein the cell replacement threshold is the minimum number of cells allowed in the active set, It can be set by the above measurement control message. For detailed description, refer to 3GPP TS 25.331, and details are not described herein again. It is worth noting that 1c type events can cause cells with poor signal strength or poor signal to noise ratio to be replaced.

It is worth noting that after the user transmits the measurement report message, if the universal terrestrial global wireless access network does not update the activity set (if the activity set update message is not transmitted or the client does not receive the activity set update message) At the same time, the UE transmits a new measurement report message after a preset time interval (referred to herein as a time-to-trace (TTT)). On the other hand, the UE periodically transmits the measurement report message to the network according to a periodic report interval (Periodic Reporting Interval). For example, the network sets the periodic report interval to 5 seconds. Therefore, the client will send back the test report message to the network every 5 seconds.

However, in the current 3GPP protocol specification, when the network (such as the universal terrestrial global wireless access network) receives the measurement report message transmitted from the client and triggered by the 1c type event, the network may Instructs the client to remove cells with good signal strength or signal-to-noise ratio from the active set, causing call drop and affecting the user's experience. The detailed reasons are as follows.

Please refer to Figure 1, which is a schematic diagram of a conventional measurement procedure. In Figure 1, the UE transmits a first measurement report message (triggered by a 1c type event) to the network to trigger a cell replacement procedure. The first measurement report message informs the network that the cell B or C is replaced by the cell D. It is assumed that cell C is the cell with the weakest signal quality in the active set ASET. Therefore, the intention of the user terminal is to replace cell C by cell D.

According to the current 3GPP communication protocol specification, when the network side processes the first measurement report message, but an activity set update message for responding to the first measurement report message has not been transmitted to the user end, for example, the network side It does not respond to all measurement feedback messages (for example, the network believes that the current communication quality of this cell does not require cell replacement), so after the trigger time/periodic return interval, The client will actively transmit a second measurement report message (triggered by the 1c type event) to the network to trigger another cell replacement procedure, wherein the second measurement report message informs the network side that the cell B or C is Cell E is replaced.

It is worth noting that the client may have transmitted the second measurement report before transmitting the activity set update message in response to the first measurement report message but the client has not received the activity set update message. The message (the reason is as above) to the network. Since the network has updated the cell information in the active set ASET, that is, the network side determines that the cell C has been replaced by the cell D, when the network side processes the second measurement report message (indicating that the cell E is substituted for the cell B or C) When the cell C is not present in the active set ASET on the network side, the network may replace the cell B in the active set ASET with the cell E, thus causing cells with better communication quality (such as cell B) instead. Was replaced. In short, since the network has updated the cell information in the active set ASET, the second measurement report message will cause unnecessary removal/replacement of cells (such as cell B) on the network side, and affect the call service/ quality. In addition, cell D and cell E may only have good signal quality/intensity in a short period of time. Therefore, when the user leaves the service range of cell A, the wireless connection of the cell A, D, and E in the active set ASET is both It will not be able to continue, resulting in a disruption of the call.

As can be seen from the above, the network will face two race conditions for measuring the return message, such as the first measurement report message indicating that cell B or C is replaced by cell D, and the second measurement report message. It indicates that cell B or C is replaced by cell E. In this case, since cell C may have been replaced by cell D, the cell replacement program may cause communication disruption. On the other hand, the network side error assumes that the cells indicated in the measurement report message for cell replacement are present in the active set. However, since the network has updated the active set, the measurement report indicates Cells may not be present in the active set, causing communication disruptions.

Accordingly, the present invention provides a method and associated communication device for a wireless communication system for processing a measurement reward program to reduce the probability of a call interruption.

The present invention discloses a method for processing a measurement reporting program for a network of a wireless communication system, the network comprising an activity set for recording a mobile device capable of providing a service to the wireless communication system Cell identification of the cell, the method comprising: receiving a measurement report message transmitted from the mobile device, wherein the measurement report message is used to notify a cell replacement program and includes a first cell identification of the first cell Determining whether the first cell identification of the first cell is present in the active set, and whether the number of cell identifications recorded in the active set exceeds a predetermined number for generating a determination result; and performing the cell according to the determination result Replace the program.

The invention further discloses a network for a wireless communication system for processing a measurement report program, the network end comprising an activity set for recording a mobile device capable of providing a service to the wireless communication system The cell of the cell is identified and includes: a device for receiving a measurement report message transmitted from the mobile device, wherein the measurement report message is used to notify a cell replacement program and includes a first cell a cell identification device for determining whether the first cell identification of the first cell is present in the active set, and whether the number of cell identifications recorded in the activity set exceeds a predetermined number to generate a determination result; And means for performing the cell replacement procedure based on the result of the determination.

Please refer to FIG. 2, which is a schematic diagram of a wireless communication system 10 according to an embodiment of the present invention. The wireless communication system 10 can be a Universal Mobile Telecommunications System (UMTS) or any other similar network system, which is composed of a network and a plurality of mobile devices. In a universal mobile communication system, the network can be a Universal Terrestrial Radio Access Network (UTRAN), and the mobile devices can be regarded as user terminals (UEs), such as mobile phones, computer systems, and the like. . In addition, according to the transmission direction, the network end and the user end can be regarded as a transmitter and a receiver. For example, for an uplink (UL) transmission, the UE is the transmitter and the network is the receiver; for the downlink (DL) transmission, the network is the transmitter and the client is the client. Receiving end.

Please refer to FIG. 3, which is a schematic diagram of a communication device 20 according to an embodiment of the present invention. The communication device 20 can be the network terminal in FIG. 2, and includes a processing device 200, a storage unit 210, and a communication interface unit 220. Processing device 200 can be a microprocessor or an application-specific integrated circuit (ASIC). The storage unit 210 can be any data storage device for storing a code 214 and reading and executing the code 214 through the processing device 200. For example, the storage unit 210 can be a subscriber identity module (SIM), a read-only memory (ROM), a random access memory (RAM), a compact disc. CD-ROMs, magnetic tapes, floppy disks, optical data storage devices, and the like are not limited thereto. The control communication interface unit 220 can be a wireless transceiver for wirelessly communicating with the user terminal according to the processing result of the processing device 200.

Please refer to FIG. 4 , which is a schematic diagram of a process 40 according to an embodiment of the present invention. The process 40 is used in a network to process the measurement report program. The network has an active set for recording cell identity that provides a service to the cells of the client. The process 40 can be compiled into the code 214 and includes the following steps:

Step 400: Start.

Step 410: Receive a measurement report message transmitted from the user end, wherein the measurement report message is used to notify a cell replacement program and includes a first cell identification of the first cell.

Step 420: Determine whether the first cell identification of the first cell exists in the active set, and whether the number of cell identification records recorded in the active set exceeds a predetermined number to generate a determination result.

Step 430: Perform a cell replacement procedure according to the judgment result.

Step 440: End.

According to the process 40, when the network receives the measurement report message, the network first determines whether the first cell identification (ie, the cell to be replaced) in the measurement report message exists in the activity set, and then determines the activity concentration. Whether the number of cell recognition exceeds the replacement activation threshold, that is, the minimum number of cells allowed in the active set. When it is determined that the first cell recognition does not exist in the active set and the number of cell recognitions in the active set exceeds the cell replacement threshold, the cell replacement procedure is not triggered, and the cell identification of the active set is recorded when the first cell identification does not exist in the active set When the number does not exceed the cell replacement threshold, the newly added first cell is identified in the active set and is not removed from any cells in the active set to avoid competition in the cell replacement process (eg, the network receives two measurements separately) The message is returned, but both measurement reports indicate that the same cell is replaced by the same cell). For detailed description, reference may be made to the above, and details are not described herein again. On the other hand, if the first cell recognition is present in the active concentration and the number of cell recognitions in the active concentration exceeds the cell replacement threshold, then a general cell replacement procedure is performed.

According to the concept of the process 40, an example is as follows, and please refer to FIG. The UE transmits the first measurement report message triggered by the 1c type event to the network end, wherein the first measurement report message informs the network end that the cell B or C is replaced by the cell D, that is, the main corresponding to the cell D The signal quality on the common pilot channel (CPICH) is superior to the main shared pilot channel corresponding to cells B and C. For details, refer to the 3GPP protocol TS 25.331. Assume that cell C is the cell with the weakest signal quality in the active set ASET. Therefore, the network will replace cell C with cell D, and send the first active set update message to inform the user. At this time, the cell information in the active set ASET is updated to cells A, B, and D. However, before transmitting the first active set update message, the network end receives the second measurement report message transmitted from the user end (which satisfies the condition of the trigger time TTT or the periodic report interval (Periodic Reporting Interval), detailed For definition, refer to the above, and no further details are provided herein, wherein the second measurement report message informs the network end that the cell B or C is replaced by the cell E. In this case, the network first determines whether the cell identification of cells B and C exists in the active concentration. Since the active set has been updated to include the identification of cells A, B, and D, cell recognition of cell C is not in the active set. The network then determines if the number of cell recognitions in the active set exceeds the cell replacement threshold. When it is judged that the number of cell recognition is less than the cell replacement threshold, the network end increases the cell E to the active concentration; when it is judged that the cell identification number is greater than the fine packet replacement threshold, the cell replacement procedure is not triggered to avoid unnecessary substitution. /Remove cells in the active set, causing the call service to be interrupted.

It is worth noting that all the above steps, including the suggested steps, can be through hardware, carcass (ie, the combination of hardware devices and computer commands, the data in the hardware device is read-only software) or electronic systems. achieve. The hardware can include analog, digital, and hybrid circuits (ie, microcircuits, microchips, or germanium wafers). The electronic system may include a system on chip (SOC), a system in package (Sip), a computer on module (COM), and a communication device 20.

In summary, the present invention provides a method and apparatus for correctly processing a measurement return procedure to reduce the probability of interruption of a call service.

The above are only the preferred embodiments of the present invention, and all changes and modifications made to the scope of the present invention should be within the scope of the present invention.

ASET. . . Activity set

TTT. . . Trigger time

A, B, C, D, E. . . cell

10. . . Wireless communication system

20. . . Communication device

200. . . Processing device

210. . . Storage unit

214. . . Code

220. . . Communication interface unit

40. . . Process

400, 410, 420, 430, 440. . . step

Figure 1 is a schematic diagram of a conventional measurement and return procedure.

FIG. 2 is a schematic diagram of a wireless communication system according to an embodiment of the present invention.

FIG. 3 is a schematic diagram of a communication device according to an embodiment of the present invention.

Figure 4 is a flow chart of an embodiment of the present invention.

FIG. 5 is a schematic diagram of a measurement and return procedure according to an embodiment of the present invention.

40. . . Process

400, 410, 420, 430, 440. . . step

Claims (6)

A method for processing a measurement reporting program for a network of a wireless communication system, the network comprising an active set for recording a mobile device capable of providing a service to the wireless communication system Cell identity of the cell, the method comprising: receiving a measurement report message transmitted from the mobile device, wherein the measurement report message is used to notify a cell replacement program and includes a first cell Determining, by the first cell, whether the first cell identification of the first cell is present in the active set, and whether the number of cell identifications recorded in the active set exceeds a predetermined number to generate a determination result; and according to the determination result , carry out the cell replacement procedure. The method of claim 1, wherein the step of performing the cell replacement procedure according to the determination result comprises: when it is determined that the first cell identification does not exist in the active set and the number of cell records recorded in the active set exceeds the pre- When the number is set, the cell replacement program is not triggered; and when the first cell identification does not exist in the active set and the number of cell identifications recorded in the active set does not exceed the preset number, the newly added first cell is identified in the The active set is not removed from any cells in the active set. The method of claim 1, wherein the predetermined amount is a minimum number of cells allowed in the active set. A network for a wireless communication system for processing a measurement report program, the network end comprising an active set for recording a mobile device capable of providing a service to the wireless communication system The cell identity of the cell and includes: a device for receiving a measurement report message transmitted from the mobile device, wherein the measurement report message is used to notify a cell replacement program, and includes a a first cell identification of a cell; a device for determining whether the first cell identification of the first cell is present in the active set, and whether the number of cell identifications recorded by the active set exceeds a predetermined number to generate a Judging result; a device for performing the cell replacement procedure based on the judgment result. The network of claim 4, wherein the device for performing the cell replacement procedure according to the determination result comprises: a device for determining that the first cell identification does not exist in the active set and The cell replacement program does not trigger the cell replacement program when the number of cell recognition records recorded by the activity set exceeds a predetermined number; and a device for identifying that the first cell identification does not exist in the activity set and the number of cell records recorded in the activity set does not exceed At the preset amount, the first cell is added to the active set and is not removed from any cells in the active set. The network side as claimed in claim 4, wherein the preset number is a minimum number of cells allowed in the active set.