KR20100059534A - Method and mobile telecommunication system for deciding slot transmission type - Google Patents

Abstract

PURPOSE: A slot electrical transmission pattern determination method and a mobile communications system for efficiently controlling the forward direction recourse are provided to determine a transmission form of a control channel slot according to the size of data. CONSTITUTION: A receiving environment of multiple mobile telecommunication terminals is received. The received environment required according to a transmission mode and the received environment of a plurality of mobile telecommunication terminals are compared(S130). A first slot transmission type is determined(S150). A second slot transmission mode is determined according to the packet size of the transmitted slot(S160). The first transmission mode and the second transmission mode are compared(S170). The final slot transmission mode is selected.

Description

METHOD AND MOBILE TELECOMMUNICATION SYSTEM FOR DECIDING SLOT TRANSMISSION TYPE}

The present invention relates to a slot transmission type determination method and a mobile communication system, and more particularly, to a slot transmission type determination method and a mobile communication system for determining a transmission type of a control channel slot according to the size of data.

In general, a mobile communication system for transmitting high-speed packet data can be broadly classified into a type supporting only data transmission and a type simultaneously supporting not only data but also voice transmission. On the other hand, the mobile communication system for the high-speed packet data transmission can use a high-speed packet data transmission channel. High-speed packet data transmission channels (e.g. Packet Data CHannel (PDCH) of 1xEV-DO and 1xEV-DV) allow multiple users to time-division the same channel (TDM: Time Division Multiplexing) to enable high-speed data transmission. It is intended to be used.

A mobile communication system for high speed packet data transmission must transmit various control information for data transmitted by being TDM transmitted to the high speed packet data transmission channel at a specific time point through a control channel. The various users who want to receive data service through the high speed packet data transmission channel are data for which user with respect to the data being transmitted at a specific time point, what length is the data being transmitted, and at what data rate. Since we do not know any information about whether or not it is being transmitted using, it is necessary to receive control information for the data in advance.

The control information on the packet data includes sub-packet length information, media access control (MAC) ID, data rate, modulation scheme, payload size, sub-packet ID (SPID). And Automatic Repeat Request (ARQ) Channel ID. As mentioned above, a transmission unit of data transmitted through a high speed packet data transmission channel in a mobile communication system for high speed packet data transmission is referred to as a sub-packet, and the length information of the subpacket is high speed packet data transmission. This refers to the temporal length of data transmitted by TDM through a channel. In a system having a variable transmission length of data, this should be known. The MAC ID is an identifier for identifying a user and assigns a MAC ID to each user who wants to receive a high-speed packet data service during system access. The data rate refers to a transmission rate of data transmitted with a temporal length of a subpacket length, and a modulation scheme indicates whether the transmitted data is data modulated by any of modulation schemes such as QPSK, 8PSK, 16QAM, and 64QAM. Indicates. The payload size refers to the number of information bits constituting one subpacket, and the subpacket ID (SPID) is used to support retransmission as an identifier for each of the series of subpackets. The ARQ channel ID is used to distinguish a parallel transport channel as an identifier for supporting continuous data transmission to a user.

A mobile communication system for high-speed packet data transmission may transmit three types of slots, synchronous slots, asynchronous slots, and sub-synchronous slots, using a control channel.

A mobile communication system for high speed packet data transmission may use a control channel in the form of transmission of [1024, 16, 1024] or [1024, 8, 512]. In [A, B, C], A denotes a preamble size, B denotes a transmission slot size, and C denotes a packet size. The mobile communication system and mobile communication terminal for high-speed packet data transmission may use the Enhanced Control Channel MAC Protocol or Subtype 2 Physical Layer Protocol defined in the standard, and when using the protocol, 38.4 Kbps [1024, 16, 1024 ] Or [128, 4, 1024], [256, 4, 1024], [512, 4, 1024] in addition to the two transmission types of 76.8 Kbps [1024, 8, 512].

Three types of transmissions [128, 4, 1024], [256, 4, 1024] and [512, 4, 1024] are higher than those of [1024, 8,1024] or [1024, 8, 512]. Since the high noise ratio is required, there is a possibility that the slot may not be received depending on the reception environment of the mobile communication terminal. That is, there is a problem in that data may not be properly transmitted to the mobile communication terminal in a region where a reception environment such as a cell boundary region is poor.

The present invention relates to a slot transmission type determination method and system for determining a transmission type of a control channel slot according to the size of data.

The slot transmission type determination method of the present invention comprises the steps of: a) storing a necessary reception environment according to a transmission type; b) receiving a reception environment of a plurality of mobile communication terminals; c) determining a first slot transmission type by comparing a reception environment required according to the transmission type with a reception environment of the plurality of mobile communication terminals; d) determining a second slot transmission type according to a packet size of a slot to be transmitted; And e) comparing the first slot transmission type with the second slot transmission type to select a final slot transmission type.

The mobile communication system of the present invention comprises a storage unit for storing reception environment information required according to a slot transmission form, and compares reception environment information of a plurality of mobile communication terminals with reception environment information stored in the storage unit to transmit the first slot. The second slot transmission type is determined according to the packet size of the slot to be transmitted, and the final slot transmission type is selected by comparing the first and second slot transmission types.

In the slot transmission type determination method of the present invention, the slot transmission type may be determined according to the radio reception environment of the mobile communication terminal, thereby effectively controlling the amount of forward radio resource usage.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the scope of the present invention is not limited to the following preferred embodiments.

A mobile communication system (hereinafter, referred to as a mobile communication system) for high speed packet data transmission uses three types of synchronous slots, asynchronous slots, and sub-synchronous slots using control channels. Slot can be transmitted

The mobile communication system can use the control channel in the form of transmission of [1024, 16, 1024] or [1024, 8, 512]. In [A, B, C], A denotes a preamble size, B denotes a transmission slot size, and C denotes a packet size. A slot of 38.4 Kbps [1024, 16, 1024] can be transmitted via MAC ID = 3, and a slot of 76.8 Kbps [1024, 8, 512] can be transmitted via MAC ID = 2. . Since the mobile communication system does not tell the mobile communication terminal which of the two types it is using, it selects any one of the above two types of transmissions. The mobile communication system and the mobile communication terminal can use the Enhanced Control Channel MAC Protocol or Subtype 2 Physical Layer Protocol defined in the standard, and when using the protocol, 38.4 Kbps [1024, 16, 1024] or 76.8 Kbps [1024 [128, 4, 1024], [256, 4, 1024], [512, 4, 1024] may be additionally used in addition to the two transmission types of [8, 512]. This means that in addition to allocating 1024 bits as the preamble size to form one physical channel, the physical channel can be configured with preamble sizes of 128, 256, and 512 bits. It is called.

In order to use three additional short packets, the mobile communication terminal can receive through MAC ID = 71 if the CCShortPackets MAC ID is not determined and through the value if the CCShortPackets MAC ID is determined.

Packet transmission in the mobile communication system has a 4-slot interlace as shown in FIG. 1. The Enhanced Control Channel MAC Protocol uses 16 slots and therefore occupies less forward resources than architectures with 32 or 64 transport slots. The four-slot staggering scheme is used by all forward channels of the mobile communication system to achieve time diversity. In order to transmit the sync slot, only a transmission type of [1024, 16, 1024] or [1024, 8, 512] may be used, which transmits the mobile communication system information without error to the mobile communication terminal located at the cell boundary. For sake. When the mobile communication terminal sends an auxiliary synchronous slot or an asynchronous slot to reduce the resource usage of the forward channel using the Enhanced Control Channel MAC Protocol or the Subtype 2 Physical Layer Protocol, the mobile communication terminal determines the transmission type according to the length of data to be transmitted.

2 is a diagram illustrating a physical channel structure of a control channel. Auxiliary slots or asynchronous slots can be transmitted in the form of short packets depending on the length of the data. Three types of short packets are higher than those of [1024, 8, 1024] or [1024, 8, 512]. Requires a signal-to-noise ratio.

3 is a diagram illustrating a structure of a route update message according to an embodiment of the present invention. In the present invention, the route update message further includes DRCValueIncluded and DRCValue fields in addition to the fields defined in the CDMA2000 High Rate Packet Data Air Interface Specification. In the present invention, two embodiments using the PilotSterngth field and the DRCValueIncluded and DRCValue fields added to the CDMA2000 High Rate Packet Data Air Interface Specification will be described.

The slot transmission type determination method of the present invention stores a reception environment required by the mobile communication system according to the transmission type. Then, the reception environment information of each mobile communication terminal is received through the route update message of the plurality of mobile communication terminals. In the present invention, the reception environment information may be a PilotStrength field value or a DRCValue field value. The mobile communication system updates whenever receiving environment information is received from the mobile communication terminal. The mobile communication system determines the first slot transmission type FORMAT_1 by comparing the required reception environment with the reception environment for each mobile communication terminal according to the transmission type. The mobile communication system determines the second slot transmission type FORMAT_2 according to the size of the MAC layer packet of the slot to be transmitted. The mobile communication system compares the first slot transmission type and the second slot transmission type, selects a final slot transmission type TX_FORMAT, and transmits an auxiliary synchronous slot or an asynchronous slot. The case where the reception environment information is a PilotStrength field value or a DRCValue field value will be described in detail below by dividing an embodiment.

First Embodiment-Method of Using PilotStrength Field Value of Route Update Message

The mobile communication system has a mapping table as shown in Table 1 representing a reception environment of a mobile communication terminal, that is, a value of a PilotStrength field, according to a transmission type. The mobile communication system may have different PilotStrength field values in sector units, that is, every PN (pseudo random noise code) value according to a transmission type.

Transmission mode Pilotstrength [128, 4, 1024] -4 dB [256, 4, 1024] -3 dB [512, 4, 1024] -2 dB

A transmission type of [512, 4, 1024] requires a better wireless environment than that of [128, 4, 1024] or [256, 4, 1024]. That is, the required PilotStrength field value is larger. The mobile communication system may refer to Table 1 to determine a transmission type of a slot.

The mobile communication system updates the PilotStrength at each PN value through route update messages of all mobile communication terminals. In order to distinguish a mobile communication terminal, a unicast access terminal identifier (UATI) or a hardware ID may be used.

Since a mobile communication terminal always transmits a route update message when transmitting a message using a synchronous slot according to a standard, the mobile communication system uses the most recent PilotStrength field value when attempting to connect with the mobile communication terminal. You can get it. This field value is used in the process of determining the transmission type of the auxiliary synchronous slot or the asynchronous slot in response to the call connection attempt.

4 is a flowchart illustrating a call connection attempt between a mobile communication terminal and a mobile communication system according to an exemplary embodiment of the present invention. In the procedure of FIG. 4, the mobile communication system uses ACAck and TrafficChannelAssignment messages. The message after the RTCAck message is transmitted through a traffic channel.

5 is a flowchart illustrating a process of determining a transmission type of an auxiliary synchronous slot or an asynchronous slot when a call is connected according to an embodiment of the present invention, and FIG. 6 is a slot transmission type corresponding to a pilotstrength according to an embodiment of the present invention. It is a figure shown. The mobile communication system receives a route update message from a plurality of mobile communication terminals (S110). The PilotStrength of each UE is updated using the ReferencePilotStrength and PilotStrength field values (S120). The mobile communication system determines whether the mobile communication terminal supports the Enhanced MAC Protocol (S130). If the mobile communication system does not support the Enhanced MAC Protocol, the mobile communication system selects the same transmission type as that of the synchronization slot or the asynchronous slot (S140). ), If the mobile terminal supports the Enhanced MAC Protocol, the mobile communication system compares the PilotStrength of the mobile terminal with the PN value of the sector to which the message is to be transmitted and the required PilotStrength according to the short packet transmission type as shown in Table 1. FORMAT_1 is determined (S150). Referring to FIG. 6, when the FORMAT_1 is determined, when the PilotStrength of the mobile communication terminal is greater than -3 dB, [512, 4, 1024] is selected as the transmission type, and when the value is between -3 dB and -4 dB, the transmission type is [256]. , 4, 1024]. If the value is between -4dB and -5dB, select [128, 4, 1024] as the transmission type. If the value is less than -5dB, it follows the transmission type of the sync slot.

In the mobile communication system, three types of transmission of short packets may have MAC layer packet sizes having different sizes. 7 is a diagram illustrating the structure of a physical channel according to a transmission form of a short packet according to an embodiment of the present invention. The mobile communication system determines FORMAT_2 according to the MAC Layer Packet size of the message to be transmitted (S160). 8 is a diagram illustrating a transmission form determined according to the MAC layer packet size of a message according to an embodiment of the present invention. Referring to FIG. 8, when the FORMAT_2 is determined, if the size of the MAC layer packet of the slot to be transmitted is 98 bits or less, [128, 4, 1024] is selected as the transmission format of the slot, and is larger than 98 bits and 226 bits. If smaller, select [256, 4, 1024] as the transmission type of the slot. If it is larger than 226 bits and less than 482 bits, select [512, 4, 1024] as the transmission type of the slot. Select the transmission type of the slot. The transmission type of TX_FORMAT is selected using the FORMAT_1 and FORMAT_2 (S170). The TX_FORMAT transmission type selection process will be described later.

The mobile communication terminal transmits a route update message when attempting to connect a call. In this case, the mobile communication system can receive the route message and most accurately predict the radio environment of the terminal. However, when the incoming signal (page message) is transmitted from the mobile communication system to the mobile communication terminal, the latest PilotStrength cannot be used. Therefore, the mobile communication system can use PilotStrength of the route message previously transmitted by the terminal. If the mobile communication system does not store the PilotStrength, the transmission type of the auxiliary synchronization slot or the asynchronous slot is the same as the transmission type of the synchronization slot. If the PilotStrength of the mobile communication terminal is known, the transmission type of the auxiliary synchronization slot containing the page message uses a process of selecting TX_FORMAT as follows. Referring to FIG. 9, if any one of FORMAT_1 and FORMAT_2 has the same transmission type as the synchronization slot or if the transmission types of FORMAT_1 and FORMAT_2 are different from each other, the mobile communication system selects the transmission type as the transmission slot of TX_FORMAT. If the transmission types of FORMAT_1 and FORMAT_2 are the same, the transmission type of TX_FORMAT is selected as the corresponding transmission type.

If the mobile communication terminal does not receive the auxiliary synchronization slot or asynchronous slot, the mobile communication system attempts to retransmit the auxiliary synchronization slot or asynchronous slot. In this case, the transmission type of TX_FORMAT is selected again. Referring to FIG. 10, the transmission form of TX_FORMAT according to the number of slot retransmissions is changed according to Th_128, Th_256, and Th_512 values, which are threshold values. For example, if the number of retransmissions (Try128, Try256, Try512) is less than Th_128, which is a threshold value of [128, 4, 1024] transmission type, select [128, 4, 1024] as the transmission type of the slot, and select [128, 4, 1024] If it is larger than Th_128, which is the threshold of the transmission type, and less than Th_256, which is the threshold of the transmission type, select [256, 4, 1024] as the slot type, and select [256, 4]. , 1024] [512, 4, 1024] selects [512, 4, 1024] as the slot's transmission type if it is larger than Th_256, the threshold of the transmission type, and less than Th_512, the threshold of the transmission type. 1024] If the transmission type is smaller than Th_512, the transmission type of the slot is selected as the transmission type of the slot.

Second Embodiment-Method of Using the DRCvalue Field Value of a Route Update Message

The mobile communication terminal can inform the mobile communication system of the reception environment through a route update message. The DRCValueIncluded field indicates whether the DRCValue is valid. If 0, DRCValue is not valid. If 1, DRCValue is valid. In addition, the mobile communication terminal sets a DRCValue corresponding to the reception environment.

The mobile communication system has a mapping table as shown in Table 2 representing a reception environment of a mobile communication terminal according to a transmission type, that is, a DRCValue field value. The mobile communication system may have different DRCValues depending on the transmission type for every sector (ie, every PN value).

Transmission mode Pilotstrength [128, 4, 1024] -4 dB [256, 4, 1024] -3 dB [512, 4, 1024] -2 dB

The transmission type of [512, 4, 1024] requires a better reception environment than that of [128, 4, 1024] or [256, 4, 1024]. That is, the required DRCValue is greater. The mobile communication system may refer to Table 2 to determine the transmission type of the control slot. The mobile communication system determines FORMAT_1 using DRCValue in the following manner. Referring to FIG. 11, when the DRCValue of the mobile communication terminal is greater than 5, [512, 4, 1024] is selected as a transmission type of an auxiliary synchronous slot or an asynchronous slot, and when the value is between 5 and 4, [256, 4, 1024], if the value is between 4 and 3, select [128, 4, 1024] as the transmission type. If the value is 3 or less, the transmission type of the synchronization slot is followed.

The process of selecting FORMAT_2 and TX_FORMAT by the mobile communication system is the same as described in the first embodiment.

Those skilled in the art to which the present invention pertains will understand that the present invention can be implemented in other specific forms without setting the technical spirit or essential features. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive. The scope of the present invention is shown by the following claims rather than the detailed description, and all settings or modifications derived from the meaning and scope of the claims and their equivalent concepts should be construed as being included in the scope of the present invention. do.

1 is a view showing a packet transmission method according to an embodiment of the present invention.

2 illustrates a physical channel structure of a control channel according to an embodiment of the present invention.

3 illustrates a structure of a route update message according to an embodiment of the present invention.

4 is a call connection attempt procedure between a mobile communication terminal and a mobile communication system according to an embodiment of the present invention.

5 is a flowchart illustrating a process of determining a transmission type of an auxiliary synchronous slot or an asynchronous slot according to an embodiment of the present invention.

6 is a diagram illustrating a slot transmission form corresponding to PilotStrength according to an embodiment of the present invention.

7 illustrates a structure of a physical channel according to a transmission form according to an embodiment of the present invention.

8 is a diagram illustrating a transmission form determined according to a MAC layer packet size of a message according to an embodiment of the present invention.

9 is a flowchart illustrating a process of determining TX_FORMAT according to an embodiment of the present invention.

10 is a flowchart illustrating a process of determining a transmission type according to the number of retransmissions of a slot according to an embodiment of the present invention.

11 is a view showing a slot transmission form corresponding to a DRCValue according to an embodiment of the present invention.

Claims (9)

In the slot transmission type determination method of the mobile communication system, a) storing the required receiving environment according to the transmission type; b) receiving a reception environment of a plurality of mobile communication terminals; c) determining a first slot transmission type by comparing a reception environment required according to the transmission type with a reception environment of the plurality of mobile communication terminals; d) determining a second slot transmission type according to a packet size of a slot to be transmitted; And e) comparing the first transmission form with the second transmission form and selecting a final slot transmission form. The method of claim 1, And reselecting the final transmission type according to the number of retransmissions performed by the mobile communication system when the mobile communication terminal does not receive the slot. The method of claim 2, The receiving environment information is received via a route update message (Route Update Message) of the plurality of mobile communication terminal, slot transmission type determination method. The method of claim 3, And the reception environment information is a PilotStrength field value or a DRCValue field value of the route update message. The method of claim 1, And the packet is a MAC layer packet. 6. The method according to any one of claims 1 to 5, In the step e), the mobile communication system is the same slot transmission form as the synchronization slot or any one of the first slot transmission form and the second slot transmission form or the first and second slot transmission form is different from each other Selecting the same transmission form as the sync slot as the last slot transmission form, and selecting the last slot transmission form as the corresponding slot transmission form when the first and second slot transmission forms are the same. As a mobile communication system, A storage unit configured to store reception environment information required according to a slot transmission type, and compares reception environment information of a plurality of mobile communication terminals with reception environment information stored in the storage unit to determine a first slot transmission type, and to transmit a slot The second slot transmission form is determined according to the packet size of the mobile communication system, and the final slot transmission form is selected by comparing the first and second slot transmission forms. The method of claim 7, wherein And the reception environment information is a PilotStrength field value or a DRCValue field value of a Route Update Message of the plurality of mobile communication terminals. The method of claim 7, wherein The packet is a MAC layer packet.

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