Method for signaling of the compressed mode parameters to a mobile station

Method for transmitting compressed mode parameters to mobile station Technical field

[0001] The present invention generally relates to mobile radio communication systems, and more particularly to a mobile radio communication system called a code division multiple access (CDMA) system.

Background technique

[0002] CDMA technology is particularly suitable for so-called third-generation systems such as Universal Mobile Telecommunication System (UMTS), which provide services at a higher data rate than the current so-called second-generation systems, such as Global System for Mobile Phones (GSM) ο

[0003] Generally speaking, as shown in FIG. 1, a mobile radio communication system includes a radio access subsystem, which includes a plurality of base stations (also referred to as "B nodes" in UMTS), and A device that controls a base station (also known as a radio network controller or RNC in UMTS). The system composed of Node B and RNC is also called UMTS Terrestrial Radio Access Network (UTRAN). UTRAN first communicates with the mobile station (also known as User Equipment (UE) in UMTS), and secondly communicates with the network and switching subsystem (not shown).

[0004] Generally speaking, this kind of system is a cellular architecture, and when a user moves, a "handover" technique is used to transfer a call from one cell to another. In addition, the commonly used technology is the Mobile Assisted Handover (MAH0) technology. In this technology, the mobile station broadcasts from the neighboring cell to the control channel of the cell serving it, performs radio measurement, and reports the radio measurement result to Network so that the network can easily make decisions about handovers.

[0005] Another technology widely used in CDMA systems is called macrodiversity transmission or soft handover technology, in which one mobile station is connected to multiple base stations at the same time. By using appropriate techniques for processing and combining the various signals received by the mobile station (especially by means of "Rake" type receivers) from various base stations, the performance during reception can be improved, and calls can be blocked during transmission between cells. The risk of loss is minimal. The difference is that in the "hard" handover technology, the mobile station is only connected to one base station at any moment.

[0006] When a mobile station is moving, a new cell is added to a cell group (also called an active group), and the mobile station uses soft handover technology to connect to the active group and connects to the cell that needs to perform radio measurement. The table (also called neighboring cell) can be changed. In some cases, the mobile station may be required to perform radio measurements on a frequency that is different from the frequency currently used by the active group for the current call.

[0007] An example of a situation in which a mobile station may be required to perform radio measurements on a frequency different from the one currently in use corresponds to a situation where a system such as UMTS includes two types of cells, the frequency domain duplex (FDD) type of cell utilization Wideband CDMA (W-CDMA) works in the first frequency band, and time-domain duplex (TDD) type cells use Time Division CDMA (TD-CDMA) to work in the second frequency band.

[0008] Another example corresponds to a situation where the system includes two types of cells, especially GSM cells and

UMTS cells, where UMTS cells are sequentially introduced into the existing infrastructure corresponding to the GSM system.

[0009] Another example corresponds to a situation where a CDMA system has a different number of carrier frequencies allocated to each cell, and these frequencies are a function of the traffic density in the cell.

[0010] Another example corresponds to a situation where the CDMA system has a multi-layer architecture (consisting of a macro cell, a micro cell, or actually a pico cell), and in which different carrier frequencies are assigned to different Floor.

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[0011] In a CDMA system, in order to enable a mobile station to perform radio measurements on a frequency different from the frequency used by the current call of the so-called "connected" node, it is known to use a "compressed" transmission mode, in which, Downlink transmission is interrupted in a given time interval called a "transmission gap" to allow two mobile stations to perform the measurement and increase the data rate outside the time interval in order to compensate for the Transmission gap. The content shown in Figure 2 is applied to this situation, that is, the information to be transmitted is structured in the form of frames. Figure 2 shows a series of consecutive frames including compressed frames (such as T1) and uncompressed frames (such as T2). The data rate can be increased in the compressed frame, for example by using a spreading code of less length, or by applying error correction coding to the information to be transmitted and then increasing the contraction rate.

[0012] For more flexibility, the parameters can be changed, especially the duration and/or frequency of the transmission gap can be changed (as a function of various factors such as network configuration, mobile station travel speed, radio propagation conditions, etc. ). These parameters are then advantageously sent by the network to the mobile station.

[0013] Therefore, in UMTS, the document 3GTS25.212 published by the Third Generation Partnership Project (3GPP) defines the following compressed mode parameters:

[0014]-Transmission Gap Period (TGP), that is, the reception period for a group of consecutive frames containing up to two transmission gaps;

[00 A transmission gap distance (TGD) or the transmission duration between two consecutive transmission gaps in TGP;

[0016] a transmission gap length (TGL) for the duration of the transmission gap, including TGL1 as the duration of the first transmission gap in the TGP, and TGL2 as the duration of the second transmission gap in the TGP; and

[0017]-Mode duration (PD) corresponding to the total transmission time of all TGPs.

[0018] The document 3G TS25.331 V3.2.0 published by 3GPP also defines the signaling message for transmitting these compressed mode parameters to the UE. Generally speaking, these messages are messages transmitted by the UTRAN to the UE, and the UTRAN is performing radio resource control (RRC) at the same time.

[0019] It has been remembered that in systems such as UMTS, multiple services can be delivered on a connection at the same time, that is, multiple transport channels can be multiplexed on one or more dedicated physical channels (or spreading codes) allocated to the connection . Radio resources or physical channels are also allocated in a flexible manner to different services, which are a function of the required service and a function of various factors such as radio conditions and/or the traffic encountered.

[0020] Therefore, according to the document 3G TS25.331 V3.2.0, compressed mode parameters are transmitted in various signaling messages transmitted from UTRAN to the UE in order to:

[0021]-Confirm the connection request, which is applied to the message called RRC connection establishment or RRC connection re-establishment in this document;

[0022]-A multiplexing scheme for establishing, configuring or releasing a transport channel on a physical channel, which is applied to what is called "radio bearer establishment", "radio bearer reconfiguration", and "radio bearer release" in this document Message

[0023]-Reconfiguration of the transport channel and/or physical channel, which is applied to the message called "transport channel reconfiguration" and "physical channel reconfiguration" in this document;

[0024] You can also refer to the points 10. 3. 6. 17 and 10. 3. 6. 22 in TS25. 331 V 3. 2. 0, and combine 10. 2. 42, 10. 2. 35, 10. 2. 29, 10. 2. 23, 10. 2. 26, 10. 2. 51 and 10. 2. 18.

[0025] The applicant has noticed that there is room for improvement in the messages used to signal compressed mode parameters.

[0026] The main function of such messages is to control radio resources, and they are essentially transmitted from UTRAN to UE during the period when radio resources are allocated to the UE. The disadvantage is that this does not have to be the same as the moment when the UE needs to receive compressed mode parameters. Unanimous.

[0027] For example, when a new cell is added to a group of cells connected to a mobile station using soft handover technology, the neighbor cell list on which the mobile station needs to perform radio measurements can be changed, and in some cases (In particular corresponding to the example given above), the mobile station needs to make radio measurements on a frequency different from the frequency currently used by the call. Then the compressed mode parameters need to be sent to a mobile station that is independent of any changes in the radio resources allocated to it.

[0028] Similarly, the network will find that the compressed mode parameters need to be modified, for example, as a function of one or more of the aforementioned factors, so that these parameters are independent of any changes in the radio resources allocated to the UE.

[0029] Naturally, these deficiencies can be avoided by resending these radio resource control messages, as long as the compressed mode parameters will be transmitted to the UE, even if it is inconsistent with the changes in the radio resources allocated to the UE. However, since each such message will require the existence of radio resource allocation information, which makes it necessary to retransmit this information meaninglessly, it will not correspond to the effective use of available radio resources, or will increase the network meaninglessly. The total amount of traffic in the network and the total level of interference.

[0030] Conversely, these deficiencies can be transmitted to the UE in advance in these radio resource messages. Even if the UE only needs radio resource control information, this is not optimal, especially because the compressed mode parameters are The moment when the transmission to the UE becomes necessary can still vary.

[0031] In addition, generally speaking, in a system using mobile-assisted handover, the network can also send control parameters to the mobile station, which are related to radio measurements to be performed on neighboring cells.

[0032] For example, in a system such as UTMS, the document TS25.331V3.2.0 provides a dedicated signaling message called "measurement control" for transmitting these radio measurement control parameters from UTRAN to the UE. In addition, the control measurement message specifies the type of measurement to be performed, in particular:

[0033] -Intra-frequency measurement, that is, on the same frequency as the frequency used by the current call;

[0034]-Inter-frequency measurement, that is, on a frequency different from the frequency used by the current call;

[0035]-Inter-system measurement, that is, in a system different from the system used to implement the current call (for example, the aforementioned GSM system).

[0036] In addition, the compression mode parameters may be different according to the measurement type, and conversely, for a given type, there may be multiple compression mode parameters.

[0037] Therefore, currently in the document TS25.331V3.2.0, it is necessary to refer to the type of measurement they are intended for in the compressed mode parameters, resulting in an additional degree of complexity.

SUMMARY OF THE INVENTION

[0039] A specific purpose of the present invention is to avoid the various drawbacks mentioned above.

[0040] The present invention provides a method for transmitting compressed mode parameters from a mobile radio communication network to a mobile station, wherein the compressed mode parameters are transmitted from the network to the mobile station in a signaling message, and the The signaling message contains radio measurement control parameters for the radio measurement to be performed by the mobile station.

[0041] In addition, the present invention also provides a mobile radio communication network device, including: a device for sending compressed mode parameters to a mobile station in a signaling message, wherein the signaling message includes The radio measurement control parameters of the radio measurement performed by the mobile station.

[0042] In addition, the present invention also provides a mobile station, including: a device for receiving compressed mode parameters sent to the mobile station in a signaling message by a mobile radio communication network, wherein the signaling message Contains radio measurement control parameters for radio measurement to be performed by the mobile station.

[0043] In one aspect, the present invention provides a method for transmitting compressed mode parameters from a mobile radio communication system to a mobile station, wherein the compressed mode parameters are transmitted from the network to the mobile station together with control parameters. Station, the control parameter is used for radio measurements performed by the mobile station.

[0044] Thus, the transmission of these parameters is optimized, and the overall performance of the system is improved.

[0045] Advantageously, the compressed mode parameters are sent together with radio measurement control parameters, the radio measurement control parameters including the type of radio measurement to be performed, especially inter-frequency, inter-frequency or inter-system type of measurement.

[0046] Therefore, it is possible to establish a relationship between the compression mode parameters and the measurement type in a simpler and more direct manner than the above-mentioned prior art.

[0047] In another aspect, the present invention provides a mobile radio communication network that includes means for transmitting compressed mode parameters to a mobile station in a signaling message, wherein the signaling message includes The control parameters of the radio measurement performed by the mobile station.

[0048] Advantageously, the signaling message contains the type of radio measurement to be performed by the mobile station, especially an inter-frequency, inter-frequency or inter-system type of measurement.

[0049] Advantageously, in a system such as UMTS, the signaling message is a "measurement control" message for sending radio measurement control parameters in the system.

[0050] In another aspect, the present invention provides a mobile station including a compressed mode parameter for receiving a signaling message sent to it by a mobile radio communication system, the message including The station performs the control parameters of the radio measurement.

[0051] Advantageously, the signaling message contains the type of radio measurement to be performed by the mobile station, especially an inter-frequency, inter-frequency or inter-system type of measurement.

[0052] Advantageously, in a system such as UMTS, the signaling message is a "measurement control" message for sending radio measurement control parameters in the system.

BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Other objects and characteristics of the present invention will become clear by reading the following description of a given embodiment and referring to the accompanying drawings.

[0055] FIG. 1 shows the overall structure of a mobile radio communication system;

[0056] FIG. 2 is a schematic diagram for describing the transmission principle using compression parameters.

[0057] FIG. 3 is a schematic diagram for describing the method according to the present invention.

[0058] Specific embodiments

[0059] As shown in FIG. 3, especially in a system such as UMTS, the present invention is used to send compressed mode parameters from a network (UTRAN) to a mobile station (UE), where the compressed mode parameters are together with the control parameters, Sent from the network to the mobile station, the control parameter relates to the radio measurement to be performed by the mobile station. In Figure 3, the compression control parameter is the reference MC, the radio measurement control parameter is the reference MC, and the corresponding signaling message is the reference Mo

[0060] Therefore, in the present invention, the mobile station or the user equipment UE has a compressed mode parameter for receiving a signaling message sent to it by a mobile radio communication system, the message containing a parameter for performing radio measurement by the mobile station. control parameter.

[0061] Similarly, in the present invention, a mobile radio network entity such as an RNC and/or Node B has means for sending compressed mode parameters to the mobile station in a signaling message, the signaling message including The mobile station performs the control parameters of the radio measurement.

[0062] The specific implementation of these devices will not present special difficulties for those skilled in the art, and it is not necessary to describe these devices in any more detailed manner here.

[0063] Advantageously, in UMTS, the message M is a "measurement control" message set in the system. The message is used to transmit radio measurement control parameters and is particularly related to the type of radio measurement performed by the UE. Measurements are especially inter-frequency, inter-frequency or inter-system type measurements.

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