JPH09327073A - Method for arranging and transmitting pilot channel in cdma mobile communication system - Google Patents
Method for arranging and transmitting pilot channel in cdma mobile communication systemInfo
- Publication number
- JPH09327073A JPH09327073A JP8145910A JP14591096A JPH09327073A JP H09327073 A JPH09327073 A JP H09327073A JP 8145910 A JP8145910 A JP 8145910A JP 14591096 A JP14591096 A JP 14591096A JP H09327073 A JPH09327073 A JP H09327073A
- Authority
- JP
- Japan
- Prior art keywords
- pilot channel
- time
- channel
- communication system
- time slots
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims description 21
- 238000010295 mobile communication Methods 0.000 title claims description 13
- 238000004891 communication Methods 0.000 claims abstract description 21
- 230000005540 biological transmission Effects 0.000 claims description 35
- 238000009792 diffusion process Methods 0.000 abstract 6
- 238000010586 diagram Methods 0.000 description 4
- 230000006866 deterioration Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000002123 temporal effect Effects 0.000 description 1
Classifications
-
- Y02D70/449—
Landscapes
- Time-Division Multiplex Systems (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、符号分割多元接続
方式（以下、ＣＤＭＡと略称する）の移動通信システム
において複数のセルの各々に基地局が設けられ、各基地
局は同一周波数で変調され、それぞれ異なって割り当て
られた拡散コードで拡散されたパイロットチャネルを送
信し、移動局は前記パイロットチャネルを受信すること
により在圏セルを判定するＣＤＭＡ移動通信システムに
おけるパイロットチャネル配置および送信方法に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides a base station in each of a plurality of cells in a code division multiple access system (hereinafter abbreviated as CDMA) mobile communication system, and each base station is modulated at the same frequency. The present invention relates to a pilot channel arrangement and a transmission method in a CDMA mobile communication system in which a mobile station transmits a pilot channel spread by a differently assigned spreading code, and a mobile station determines a serving cell by receiving the pilot channel.
【０００２】[0002]
【従来の技術】ＣＤＭＡ移動通信システムにおいて、下
り無線チャネルでは、全ての移動機において同一セル内
の他の複数移動局に対して送信された下り無線チャネル
は全て干渉電力となり、受信品質を劣化させるかもしく
は無線チャネル容量を劣化させる要因となる。しかし各
下り無線チャネルに、お互いに直交化した複数の拡散コ
ードを用い、基地局から同一拡散コード位相で送信する
ことにより、同一セルで送信される他の下り無線チャネ
ルは直交化されて干渉電力量を０にすることができる。
ただしマルチパス環境では、拡散コード位相の異なる無
線チャネルが発生するため、干渉電力量は０にはならな
いが、干渉電力を大きく低減することが可能である。こ
れにより下り無線チャネルの受信品質の向上もしくは無
線チャネル容量の向上を見込むことができる。2. Description of the Related Art In a CDMA mobile communication system, in downlink radio channels, all downlink radio channels transmitted to other mobile stations in the same cell in all mobile stations become interference power, which deteriorates reception quality. Or, it becomes a factor that deteriorates the wireless channel capacity. However, by using multiple spreading codes that are orthogonal to each other for each downlink radio channel and transmitting in the same spreading code phase from the base station, other downlink radio channels transmitted in the same cell are orthogonalized and the interference power is reduced. The amount can be zero.
However, in a multipath environment, since radio channels having different spreading code phases are generated, the interference power amount does not become 0, but the interference power can be greatly reduced. As a result, it is possible to expect an improvement in the reception quality of the downlink radio channel or an improvement in the radio channel capacity.
【０００３】図３に従来のパイロットチャネル配置方法
を示す。従来は直交化した拡散コードの内の１つをパイ
ロットチャネル用の拡散コードとして割り当て、この拡
散コードで常時パイロットチャネルを送信し、他の拡散
コードは移動局との通信に用いる通信チャネル用として
いた。図３はＸ個ある直交化した拡散コードの内、拡散
コード１をパイロットチャネル用に割り当てている場合
を示している。FIG. 3 shows a conventional pilot channel allocation method. Conventionally, one of the orthogonalized spreading codes is assigned as a spreading code for the pilot channel, the pilot channel is always transmitted by this spreading code, and the other spreading code is used for the communication channel used for communication with the mobile station. . FIG. 3 shows a case where the spreading code 1 is allocated for the pilot channel among the X orthogonalized spreading codes.
【０００４】更に移動局の在圏セル判定のために、隣接
セルに在圏する移動局においても自局のパイロットチャ
ネルを受信できるように、パイロットチャネルは移動局
との通信に用いる無線チャネルより、比較的大きな送信
電力で送信される必要がある。従来は前述の特定の拡散
コードで、常時比較的大きな送信電力でパイロットチャ
ネルは送信されていた。Further, in order to determine the cell in which the mobile station is located, the pilot channel is set so that the mobile station located in the adjacent cell can also receive the pilot channel of the local station from the radio channel used for communication with the mobile station. It needs to be transmitted with a relatively large transmission power. Conventionally, the pilot channel was always transmitted with a relatively large transmission power by the above-mentioned specific spreading code.
【０００５】[0005]
【発明が解決しようとする課題】直交化した拡散コード
の数はそれほど多くはない。本来ＣＤＭＡ移動通信シス
テムでは無線チャネル容量は干渉電力量で決まるが、直
交化した拡散コードを用いる場合、拡散コード数の不足
により無線チャネル容量を十分に使用することができな
いという問題が起こりうる。このような状況において、
前述したように１つの拡散コードをパイロットチャネル
として専有することにより、移動局との通信に用いる拡
散コードがより不足するという問題があった。The number of orthogonal spreading codes is not very large. Originally, in a CDMA mobile communication system, the radio channel capacity is determined by the amount of interference power. However, when orthogonalized spreading codes are used, the problem that the wireless channel capacity cannot be fully used due to the insufficient number of spreading codes may occur. In such a situation,
As described above, by occupying one spreading code as the pilot channel, there is a problem that the spreading code used for communication with the mobile station becomes insufficient.
【０００６】更に前述したように、パイロットチャネル
は比較的大きな送信電力で常時送信されていたため、隣
接セルに対して大きな干渉を与え、隣接セルの容量を減
少させるという問題があった。Further, as described above, since the pilot channel is constantly transmitted with a relatively large transmission power, there is a problem that it causes a large interference to the adjacent cells and reduces the capacity of the adjacent cells.
【０００７】本発明は、上記に鑑みてなされたもので、
その目的とするところは、下り無線チャネルを時間分割
多重して、パイロットチャネルを効率的に割り当てると
ともに、他セルに対するパイロットチャネルの干渉電力
を低減し得るＣＤＭＡ移動通信システムにおけるパイロ
ットチャネル配置および送信方法を提供することにあ
る。[0007] The present invention has been made in view of the above,
An object of the present invention is to provide a pilot channel arrangement and a transmission method in a CDMA mobile communication system capable of efficiently allocating a pilot channel by time-division multiplexing downlink radio channels and reducing interference power of the pilot channel to other cells. To provide.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、請求項１記載の本発明は、複数のセルの各々に基地
局が設けられ、各基地局は同一周波数で変調され、それ
ぞれ異なって割り当てられた拡散コードで拡散されたパ
イロットチャネルを送信し、移動局は前記パイロットチ
ャネルを受信することにより在圏セルを判定するＣＤＭ
Ａ移動通信システムにおけるパイロットチャネル配置お
よび送信方法であって、基地局から移動局方向への下り
無線チャネルを複数のタイムスロットに時間分割して時
間分割多重し、前記複数のタイムスロットのうちの１つ
をパイロットチャネルとして割り当てることを要旨とす
る。In order to achieve the above object, the present invention according to claim 1 is such that a base station is provided in each of a plurality of cells, each base station is modulated at the same frequency, and the base stations are different from each other. A CDM that determines a serving cell by transmitting a pilot channel spread by an assigned spreading code, and the mobile station receiving the pilot channel.
A pilot channel allocation and transmission method in a mobile communication system, wherein a downlink radio channel from a base station to a mobile station is time-divided into a plurality of time slots and time-division multiplexed, and one of the plurality of time slots is used. The purpose is to assign one as a pilot channel.
【０００９】また、請求項２記載の本発明は、請求項１
記載の発明において、パイロットチャネルとして割り当
てる前記タイムスロットの時間的な位置を全セルで共通
とすることを要旨とする。Further, the present invention according to claim 2 is based on claim 1.
In the invention described above, the gist is that the time position of the time slot allocated as a pilot channel is common to all cells.
【００１０】更に、請求項３記載の本発明は、請求項１
または２記載の発明において、パイロットチャネルとし
て割り当てる前記タイムスロットのみ常時一定の送信電
力で送信し、移動局との通信用の他のタイムスロットは
送信電力制御を行うことを要旨とする。[0010] Further, the present invention according to claim 3 provides the invention according to claim 1.
Alternatively, in the invention described in the second aspect, only the time slot assigned as a pilot channel is constantly transmitted with a constant transmission power, and transmission power control is performed for other time slots for communication with a mobile station.
【００１１】[0011]
【発明の実施の形態】以下、図面を用いて本発明の実施
の形態について説明する。BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明の一実施形態に係るＣＤＭ
Ａ移動通信システムにおけるパイロットチャネル配置お
よび送信方法を実施するパイロットチャネルの配置方法
の一例を示す図である。同図に示すように、Ｘ個の拡散
コードからなる下り無線チャネルの全てはフレーム構成
をとり、１フレームは複数のタイムスロットに分割さ
れ、時分割多重されている。図１では４個のタイムスロ
ットに分割し、４多重した場合を示している。FIG. 1 shows a CDM according to an embodiment of the present invention.
FIG. 3 is a diagram showing an example of a pilot channel allocation method for implementing a pilot channel allocation and transmission method in an A mobile communication system. As shown in the figure, all downlink radio channels consisting of X spreading codes have a frame structure, and one frame is divided into a plurality of time slots and time division multiplexed. FIG. 1 shows a case where the time slot is divided into four time slots and four time slots are multiplexed.
【００１３】特定の拡散コードで拡散される無線チャネ
ルの、特定のタイムスロットをパイロットチャネルとし
て割り当てる。他のタイムスロットおよび他の拡散コー
ドは移動局との通信用の通信チャネルとして用いる。図
１では、フレーム内の４個のタイムスロットについて時
間的に早い順に１〜４のタイムスロット番号をつけ、拡
散コード１で拡散される無線チャネルのタイムスロット
＃１をパイロットチャネルとして割り当て、他のタイム
スロットおよび拡散コードを通信チャネルとして割り当
てた場合を示している。これにより従来パイロットチャ
ネルが１拡散コードを専有していたのに対し、本実施形
態ではパイロットチャネルは実質１／４拡散コードのみ
専有するのと等価となり、拡散コードの不足問題に対す
るパイロットチャネルの影響を低減できる。A specific time slot of a radio channel spread by a specific spreading code is assigned as a pilot channel. Other time slots and other spreading codes are used as communication channels for communication with mobile stations. In FIG. 1, four time slots in a frame are assigned time slot numbers 1 to 4 in order from the earliest in time, and the time slot # 1 of the radio channel spread by the spreading code 1 is assigned as the pilot channel. The figure shows the case where time slots and spreading codes are assigned as communication channels. As a result, the conventional pilot channel occupies one spreading code, but in the present embodiment, the pilot channel is equivalent to occupying substantially only a quarter spreading code, and the influence of the pilot channel on the shortage of spreading codes is reduced. It can be reduced.
【００１４】移動局は、パイロットチャネルとして使用
しうる全ての拡散コードとタイムスロット＃の情報を自
局のメモリに予め記憶している。移動局は電源立ち上げ
時の在圏セル判定処理において、記憶している複数の拡
散コードとタイムスロット＃について順次パイロットチ
ャネルの受信レベル測定を行い、最も大きな受信レベル
を有する拡散コードとタイムスロットでパイロットチャ
ネルを送信しているセルを在圏セルとして判定する。待
ち受け中および通信中の在圏セル判定処理においては、
全ての隣接セルから送信されるパイロットチャネルの拡
散コードおよびタイムスロット＃の情報が在圏セルの基
地局から移動局に対して通知され、移動局は通知された
複数の拡散コードとタイムスロット＃について順次パイ
ロットチャネルの受信レベル測定を行い、最も大きな受
信レベルを有する拡散コードとタイムスロットでパイロ
ットチャネルを送信しているセルを在圏セルとして判定
する。The mobile station stores in advance in its memory the information of all spreading codes and time slots # that can be used as pilot channels. The mobile station sequentially measures the reception level of the pilot channel for a plurality of stored spreading codes and time slots # in the serving cell determination process when the power is turned on, and uses the spreading code and time slot with the largest receiving level. The cell transmitting the pilot channel is determined as the serving cell. In the process of determining the serving cell during standby and communication,
Information of the spreading code and time slot # of the pilot channel transmitted from all neighboring cells is notified from the base station of the serving cell to the mobile station, and the mobile station is notified of the plurality of spreading codes and time slots #. The reception level of the pilot channel is sequentially measured, and the cell transmitting the pilot channel with the spreading code and the time slot having the highest reception level is determined as the serving cell.
【００１５】ここで他のパイロットチャネル配置方法と
して、パイロットチャネルを割り当てるタイムスロット
＃を全セルで共通とする。これにより移動局の在圏セル
判定処理に関し、タイムスロット番号に関する情報を移
動局は拡散コード毎に記憶する必要がなくなる。また基
地局から移動局に通知する隣接セルのパイロットチャネ
ルに関する情報は拡散コードのみでよく、タイムスロッ
ト番号を不要にできる。As another pilot channel allocation method, a time slot # to which a pilot channel is assigned is common to all cells. This eliminates the need for the mobile station to store information about the time slot number for each spreading code in the serving cell determination process of the mobile station. Further, the information about the pilot channel of the adjacent cell notified from the base station to the mobile station is only the spreading code, and the time slot number can be eliminated.
【００１６】基地局では、通信チャネルとして使用され
るタイムスロットは、ＣＤＭＡ特有の問題である遠近問
題を解決するために送信電力制御され、時間とともに送
信電力は変化する。これに対しパイロットチャネルは移
動局の在圏セル判定に用いるために一定送信電力でかつ
通信チャネルより比較的大きい送信電力で送信される必
要がある。よってパイロットチャネルとして割り当てた
特定の拡散コードの特定のタイムスロットについては、
常時一定送信電力で送信し、通信チャネルとして使用さ
れる他のタイムスロットの送信電力に対し比較的大きな
送信電力で送信する。In the base station, the time slot used as a communication channel is controlled in transmission power in order to solve the near-far problem, which is a problem peculiar to CDMA, and the transmission power changes with time. On the other hand, the pilot channel needs to be transmitted with a constant transmission power and a relatively higher transmission power than the communication channel in order to be used for the determination of the cell in which the mobile station is located. Therefore, for a specific time slot of a specific spreading code assigned as a pilot channel,
It always transmits with a constant transmission power, and transmits with a relatively large transmission power with respect to the transmission power of other time slots used as a communication channel.
【００１７】図２にパイロットチャネルを含む無線チャ
ネルの送信電力の時間的な変動例を示す。図２に示すよ
うに、パイロットチャネルとして割り当てているタイム
スロット＃１は常時一定の比較的大きな送信電力で送信
され、他の通信チャネルとして使用しているタイムスロ
ット＃２と＃３は送信電力制御され、時間とともに送信
電力値は変化する。タイムスロット＃４は未使用であり
送信されていない。FIG. 2 shows an example of temporal changes in transmission power of radio channels including pilot channels. As shown in FIG. 2, the time slot # 1 assigned as the pilot channel is always transmitted with a relatively large transmission power, and the time slots # 2 and # 3 used as other communication channels are controlled by the transmission power. The transmission power value changes with time. Time slot # 4 is unused and has not been transmitted.
【００１８】従来はパイロットチャネルが１無線チャネ
ルを専有していたため、常時一定送信電力でかつ通信チ
ャネルより比較的大きい送信電力で送信されていた。こ
れにより隣接セルへ大きな干渉を与えていた。これに対
し本実施形態ではパイロットチャネルは全時間の１／４
しか送信されないため、実質他セルへのパイロットチャ
ネルによる干渉電力は従来の１／４となり、他セルに対
する容量劣化の影響を低減できる。Conventionally, since the pilot channel occupies one radio channel, it is always transmitted with a constant transmission power and a relatively higher transmission power than the communication channel. As a result, large interference was given to the adjacent cell. On the other hand, in this embodiment, the pilot channel is 1/4 of the total time.
Since it is transmitted only, the interference power due to the pilot channel to other cells is substantially 1/4 of the conventional power, and the influence of capacity deterioration on other cells can be reduced.
【００１９】[0019]
【発明の効果】以上説明したように、本発明によれば、
下り無線チャネルを複数のタイムスロットに時間分割し
て時間分割多重し、複数のタイムスロットの内の１つを
パイロットチャネルとして割り当てることにより、従来
パイロットチャネルが１拡散コードを専有していたのに
対し、本発明では実質的に１拡散コードの時間多重数
（１フレーム内のタイムスロット数）分の１のみ専有す
ることとなるため、拡散コード不足に対するパイロット
チャネルの影響を低減できる。As described above, according to the present invention,
Whereas a downlink radio channel is time-divided into a plurality of time slots and time-division multiplexed, and one of the plurality of time slots is assigned as a pilot channel, the conventional pilot channel occupies one spreading code. However, in the present invention, since substantially 1 / spreading code's time multiplexing number (the number of time slots in one frame) is exclusively occupied, it is possible to reduce the influence of the pilot channel on the spreading code shortage.
【００２０】また、本発明によれば、パイロットチャネ
ルとして割り当てるタイムスロットの時間的な位置を、
全セルで共通とすることにより、移動局の在圏セル判定
処理に関し、タイムスロット番号に関する情報を移動局
は拡散コード毎に記憶する必要がなくなる。また基地局
から移動局に通知する隣接セルのパイロットチャネルに
関する情報は拡散コードのみでよく、タイムスロット番
号を不要にできる。Further, according to the present invention, the time position of the time slot assigned as the pilot channel is
By making it common to all cells, it becomes unnecessary for the mobile station to store information about the time slot number for each spreading code in the serving cell determination process of the mobile station. Further, the information about the pilot channel of the adjacent cell notified from the base station to the mobile station is only the spreading code, and the time slot number can be eliminated.
【００２１】更に、本発明によれば、パイロットチャネ
ルとして割り当てる前記タイムスロットのみ常時一定の
送信電力で送信し、移動局との通信用の通信チャネルと
して用いる他のタイムスロットは送信電力制御を行うこ
とにより、従来パイロットチャネルが１無線チャネルを
専有し、常時一定送信電力でかつ通信チャネルより比較
的大きい送信電力で送信されていたのに対し、本発明で
はパイロットチャネルは全時間の時間多重数（１フレー
ム内のタイムスロット数）分の１のみしか送信されない
ため、他セルへのパイロットチャネルによる干渉電力は
従来の時間多重数分の１となり、他セルに対する容量劣
化の影響を低減できる。Further, according to the present invention, only the time slot allocated as a pilot channel is constantly transmitted with a constant transmission power, and the transmission power control is performed for other time slots used as a communication channel for communication with a mobile station. As a result, the conventional pilot channel occupies one radio channel and is always transmitted with a constant transmission power and a relatively higher transmission power than the communication channel. On the other hand, in the present invention, the pilot channel has a time multiplexing number (1 Since only 1 / (the number of time slots in the frame) is transmitted, the interference power of the pilot channel to other cells becomes 1/1 of the conventional time-multiplexed number, and the effect of capacity deterioration on other cells can be reduced.
【図１】本発明の一実施形態に係るＣＤＭＡ移動通信シ
ステムにおけるパイロットチャネル配置および送信方法
を実施するパイロットチャネルの配置方法の一例を示す
図である。FIG. 1 is a diagram showing an example of a pilot channel allocation method for implementing a pilot channel allocation and transmission method in a CDMA mobile communication system according to an embodiment of the present invention.
【図２】本発明の他の実施形態におけるパイロットチャ
ネルの送信方法の一例を示す図である。FIG. 2 is a diagram showing an example of a pilot channel transmission method according to another embodiment of the present invention.
【図３】従来のパイロットチャネルの配置方法を示す図
である。FIG. 3 is a diagram showing a conventional pilot channel allocation method.
Claims (3)
各基地局は同一周波数で変調され、それぞれ異なって割
り当てられた拡散コードで拡散されたパイロットチャネ
ルを送信し、移動局は前記パイロットチャネルを受信す
ることにより在圏セルを判定するＣＤＭＡ移動通信シス
テムにおけるパイロットチャネル配置および送信方法で
あって、 基地局から移動局方向への下り無線チャネルを複数のタ
イムスロットに時間分割して時間分割多重し、前記複数
のタイムスロットのうちの１つをパイロットチャネルと
して割り当てることを特徴とするＣＤＭＡ移動通信シス
テムにおけるパイロットチャネル配置および送信方法。1. A base station is provided in each of a plurality of cells,
In a CDMA mobile communication system, each base station transmits a pilot channel modulated with the same frequency and spread with a differently assigned spreading code, and the mobile station determines a serving cell by receiving the pilot channel. A pilot channel arrangement and transmission method, wherein a downlink radio channel from a base station to a mobile station is time-divided into a plurality of time slots and time-division multiplexed, and one of the plurality of time slots is used as a pilot channel. A pilot channel arrangement and transmission method in a CDMA mobile communication system characterized by allocating.
記タイムスロットの時間的な位置を全セルで共通とする
ことを特徴とする請求項１記載のＣＤＭＡ移動通信シス
テムにおけるパイロットチャネル配置および送信方法。2. The pilot channel arrangement and transmission method in a CDMA mobile communication system according to claim 1, wherein the time position of the time slot assigned as a pilot channel is common to all cells.
記タイムスロットのみ常時一定の送信電力で送信し、移
動局との通信用の他のタイムスロットは送信電力制御を
行うことを特徴とする請求項１または２記載のＣＤＭＡ
移動通信システムにおけるパイロットチャネル配置およ
び送信方法。3. The transmission method according to claim 1, wherein only the time slot assigned as a pilot channel is constantly transmitted with a constant transmission power, and the transmission power control is performed for another time slot for communication with a mobile station. CDMA
A pilot channel allocation and transmission method in a mobile communication system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8145910A JPH09327073A (en) | 1996-06-07 | 1996-06-07 | Method for arranging and transmitting pilot channel in cdma mobile communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8145910A JPH09327073A (en) | 1996-06-07 | 1996-06-07 | Method for arranging and transmitting pilot channel in cdma mobile communication system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09327073A true JPH09327073A (en) | 1997-12-16 |
Family
ID=15395906
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8145910A Pending JPH09327073A (en) | 1996-06-07 | 1996-06-07 | Method for arranging and transmitting pilot channel in cdma mobile communication system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09327073A (en) |
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1996
- 1996-06-07 JP JP8145910A patent/JPH09327073A/en active Pending
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