JP3220051B2 - Channel assignment method considering transmission / reception timing - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system which uses a code division multiplexing system (CDMA) for a radio interface, and which can set transmission / reception timing of a base station and a mobile station to a radio line by a frame offset.
In particular, it relates to a wireless base station configuration in which a plurality of cards for transmitting and receiving a plurality of traffic channels with one CPU are provided.

[0002]

2. Description of the Related Art Code division multiplexing (CDMA) is a method in which a plurality of users multiplex by code on the same frequency using the same time. The frame offset changes the timing at the same time for each code, and all in the system follow this frame offset.

FIG. 3 shows a mobile communication system in a code division multiplexing system (CDMA), which has a card for transmitting and receiving a plurality of traffic channels with one CPU, and performs transmission and reception when the same frame offset is processed by one CPU. It is a timing chart. The timing includes a traffic channel reception timing 11 from a higher-level device, a timing 12 for transmitting a traffic channel to a radio channel, a traffic channel reception timing 13 from a radio channel, and a transmission timing to a higher-level device.
It occurs repeatedly in the frame cycle.

[0004]

In the conventional example, when a plurality of traffic channels using the same frame offset are allocated, all transmission or reception timings overlap. Therefore, there is a problem that the processing load on the CPU is instantaneously increased, and a signal is missed.

Accordingly, an object of the present invention is to solve the above problem by reducing the processing load on the CPU that is instantaneously generated, and by assigning a traffic channel from a higher-level device to a radio channel and a traffic channel from a radio channel to a higher level. It is to transmit and receive a traffic channel to a device without delay.

Another object of the present invention is to reduce the processing load, thereby increasing the number of traffic channels to one CP.
U.

[0007]

In order to achieve the above object, according to the present invention, channel allocation taking transmission / reception timing into account.
The application method includes a plurality of wireless base stations and a higher-level device that transmits a traffic channel to the wireless base station. The wireless base station wirelessly communicates a traffic channel for each of a plurality of codecs with a single CPU. Means for transmitting / receiving to / from a line, means for managing means for transmitting / receiving to / from a wireless line, and means for transmitting / receiving a control signal to / from a higher-level device;
A first buffer for managing the number of traffic channels used for each means for transmitting and receiving to the wireless line, and a second buffer for managing which frame offset is assigned to the codec of the means for transmitting and receiving to the wireless line a buffer, means for transmitting and receiving a control signal, comprising a multiplexing and demultiplexing unit for multiplexing and demultiplexing transmitted and received signals of the traffic channel between the means and the host device for transmitting and receiving the radio channel, transmitting and receiving the radio channel
Communication means, management means, control signal transmission / reception means
Each have multiple CH cards, CP cards, DUs
In the channel allocation method which is a card, a non-overlapping frame offset is allocated by a CH card for each codec of means for transmitting and receiving to a radio line,
But manages frame offsets, and receive traffic channel by a plurality of codecs in one CPU, Torahi
Communication between the CH cards that send and receive
If not, determine and assign frame offsets.
The transmission and reception timings of the host device and the wireless line are controlled so as not to be overlapped by the DU card.

[0008]

[0009]

[0010] Furthermore, it is preferable that the DU card sends a channel assignment request signal from a higher-level device to the CP card.

[0011] Preferably, the first buffer searches for a CH card to which the number of assigned traffic channels is the smallest.

Further, it is preferable that the first buffer searches for a codec to which a traffic channel is not allocated from the obtained CH card based on the result of the CH card search, and determines and stores the codec.

Further, it is preferable that the CP card reports the frame offset allocated by the second buffer to the host device as a channel allocation signal.

It is preferable that the higher-level device notifies the mobile device of the allocated frame offset through the control channel.

Further, when the value of the frame offset is 1 to
Preferably it is 16.

The channel allocation method according to the present invention in which transmission and reception timings are taken into account is particularly useful for managing a plurality of radio base stations and transmitting data to traffic channels in a higher-level device and a plurality of codes for each code in a radio base station with one CPU. Means for transmitting / receiving a traffic channel to / from a higher-level device;
PU, means for transmitting / receiving a traffic channel to / from a radio line for each code in the CH card, a plurality of CH cards,
Means for managing a plurality of CH cards, means for transmitting and receiving control signals to and from a higher-level device, means for managing the number of traffic channels used for each installed CH card, and codec decoding of the CH card The section includes means for managing which frame offset is assigned, and means for the CH card to multiplex and demultiplex the transmission / reception signals of the traffic channel with the host device.

In the channel assignment in consideration of the transmission / reception timing of the present invention, the CP card managing the entire apparatus also manages the frame offset. For this reason, it is possible to determine and assign a frame offset without the CH cards transmitting and receiving traffic channels communicating with each other.

[0018]

Next, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a channel assignment system in consideration of transmission / reception timing according to the present invention. In this method, a channel assignment request signal from the host device 6 is delivered to the CP card 4 through the DU card 5. The CP card 4 that has received the channel assignment request signal sends a first buffer 41 that manages the number of traffic channels used for each of the installed CH cards 71 to 7n.
Are searched for the CH cards 71 to 7n to which the number of traffic channels allocated is the smallest. From the search results, the codec units 91 to 9n of the obtained CH cards 71 to 7n to which traffic channels are not assigned.
Is searched, determined and stored.

The codec units 91 to 9n assigned as traffic channels are stored in a second buffer 42 for managing which frame offset is assigned.
Allows the unused frame offsets to be
Select from the frame offsets used in the card. The frame offset value has a value of 1 to 16. Specifically, the codec units 91 to 9n to which the traffic channels are assigned have the frame offset = 1.
Is used, the frame offset is assigned as a value other than 1 to the empty codec units 91 to 9n. The assigned frame offset is reported to the higher-level device 6 as a channel assignment response signal. afterwards,
A first buffer 41 that manages the number of traffic channels used for each installed CH card is incremented, and a stored frame offset is managed to determine which frame offset is allocated to a second buffer 41.
Is set in the buffer 42. The upper device 6 notifies the mobile device of the allocated frame offset through the control channel. Hereinafter, the codec 91 to 9 of the CH card
n, the mobile device, and the host device 6 transmit and receive traffic channels using the assigned frame offset.

Next, the operation of the embodiment of the present invention will be described in detail with reference to FIG.

FIG. 2 is a diagram showing the timing operation of the channel assignment system in consideration of the transmission / reception timing of the present invention. This diagram is a diagram showing transmission / reception timings to a higher-level device and a radio line when a plurality of different frame offsets are assigned to a CH card. The timing 82 for transmitting to the wireless line repeatedly occurs at a constant period. Each timing is a timing when the frame offset = 1. If the frame offset is different,
The timing 82 of transmission to the wireless line is delayed by a time obtained by multiplying the frame offset value by 1.25 ms. The same applies to the reception timing 83 from the wireless line and the reception timing 81 from the higher-level device. The CH card CPU receives a traffic channel signal from a higher-level device and waits for a timing 82 for transmitting the signal to a wireless line. When the transmission timing 82 to the wireless line is reached, the traffic channel received from the higher-level device is transmitted to the wireless line. In addition, a traffic channel signal received at a reception timing 83 from a wireless line is transmitted from the codec to the host device at the same time as the reception. With this, one CPU
Therefore, even if a plurality of frame offsets are assigned, because the frame offsets are different, the traffic channel reception timing 81 from the higher-level device, the transmission timing 82 to the radio line, and the reception timing 83 from the radio line are determined by the frame offset value. It changes on the time axis.

[0023]

According to the present invention, a plurality of communication channels that can be processed by one CPU can be transmitted to a host device or a wireless line without delay. As a result, smooth communication can be performed, and there is no delay, so that it is not necessary to prepare a buffer, and it is possible to simplify the structure of software.

Further, according to the present invention, a single CPU can process a plurality of communication channels. This makes it possible to allocate a large number of communication channels to one card (conventional mounting area), so that a high-density large-capacity device or a miniaturized device with a limited number of channels can be provided. It has the effect of becoming.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a channel assignment system in consideration of transmission timing according to the present invention.

FIG. 2 is a diagram showing a timing operation of a CH card when a frame offset is added.

FIG. 3 is a diagram showing a timing operation in a case where a conventional frame offset is not taken into account.

[Explanation of symbols]

Reference Signs List 4 CP card 5 DU card 6 Host device 7 CH card CPU unit 71, 7n CH card 11 Traffic channel reception timing from host device 12 Traffic channel transmission timing to radio line 13 Traffic channel reception timing from radio line 41 Traffic channel Buffer for managing the number used 42 Buffer for managing which frame offset is assigned 51 Traffic channel multiplexing / demultiplexing unit 81-8n CH card 91-9n Codec 81 Transmission timing of traffic channel from host device 82 Wireless line 83 Transmission timing of traffic channel to wireless network 83 Timing of reception of traffic channel from wireless line

Claims (7)

(57) [Claims] 1. A radio communication system comprising: a plurality of radio base stations; and a higher-level device that transmits a traffic channel to the radio base station. Means for transmitting / receiving a traffic channel to / from a wireless line; means for managing means for transmitting / receiving to / from the wireless line; means for transmitting / receiving a control signal to / from the higher-level device; A first buffer for managing the number of traffic channels used for each of the means for performing transmission and a second buffer for managing which frame offset is assigned to the codec of the means for transmitting and receiving to the radio line. Means for transmitting and receiving the control signal, the multiplexing / demultiplexing means for multiplexing / demultiplexing a transmission / reception signal of a traffic channel between the means for transmitting / receiving to the radio line and the higher-level device. A channel assignment system comprising a plurality of CH cards, a CP card, and a DU card, wherein each of the means for transmitting / receiving to / from the wireless line, the managing means, and the means for transmitting / receiving the control signal includes a separation unit. By assigning a non-overlapping frame offset for each codec of means for transmitting and receiving to and from the wireless line, the CP card manages the frame offset,
CH cards transmitting and receiving the traffic channel
A frame offset can be determined and assigned without performing communication, and the DU card controls the transmission and reception timings of the higher-level device and the wireless line so that they do not overlap. method. Wherein said DU card, a channel allocation request signal from the host device, and wherein the delivering the CP card, the channel assignment method in consideration of the transmission and reception timings of claim 1. Wherein said first buffer, characterized in that searching for a small number CH cards assigned the most traffic channel, the channel assignment method in consideration of the transmission and reception timings according to claim 1 or 2 . 4. The method according to claim 1, wherein the first buffer searches for a codec to which a traffic channel is not allocated of the obtained CH card from a result of the search for the CH card, and determines and stores the codec. The channel assignment method according to claim 3 , wherein the transmission and reception timing is taken into account. Wherein said CP card, the frame offset assigned by the second buffer, and wherein the report as a channel assignment signal to said host system, according to claim 1 Channel assignment method taking transmission and reception timing into account. Wherein said host system, through the control channel the assigned frame offset, characterized in that it informs the mobile station, channel allocation in consideration the reception timing according to any of claims 1 to 5 method. 7. The method according to claim 1, wherein the value of said frame offset is 1-16.
The channel assignment method according to any one of claims 1 to 6 , wherein transmission and reception timing is taken into account.