CN1487755A - Position orientation method of mobile station relative to base station, mobile radio system and orientation equipment - Google Patents

Abstract

A method for orienting the position of a mobile station (MS) relative to a base station (BS) in a mobile radio system (SYS) operating in accordance with a mobile radio standard, the method providing that a plurality of access sequence (S), so as to be used by the mobile station to send connection request signaling to the base station; the mobile station (MS) transmits one of the access sequences (S) to the base station (BS). Orientation is performed by means of an access sequence (S) received by a base station (BS).

Description

Position orientation method of mobile station relative to base station, mobile radio system and orientation equipment

technical field

The invention relates to a method for orienting the position of a mobile station relative to a base station in a mobile radio system operating according to mobile radio standards, as well as to a corresponding mobile radio system and an orienting device.

Background technique

The UMTS-TDD standard (Universal Mobile Telecommunications System, Time Division Duplex) is currently being standardized within the framework of the 3GPP (Third Generation Partnership Project). According to this standard (see 3GPPTS 25.224, V5.1.0, Chapter 5.6.3): For the first time a mobile station accesses a mobile wireless network, it needs to send an access sequence to give connection request signaling. 256 such access sequences are defined in this standard (3GPP TS25.223, V5.1.0, Appendix B, Chapter B2). Each such access sequence specified in the UMTS-TDD standard is 128 chips long. Eight of the 256 access sequences are assigned to each base station or each radio cell. The mobile station learns the available access sequences by permanently combining other cell parameters (basic midamble code, scrambling code) of the base station (see table in 3GPP TS 25.223, V5.1.0, chapter 9.3). Then, a mobile station can randomly select one of the 8 access sequences and transmit it to the base station to send connection request signaling. This is implemented in a so-called Uplink Pilot Time Slot (UpPTS), which is immediately preceding in time the first time slot of the uplink transmission frame. If the base station receives one of the access sequences, it does not know which mobile station the transmission came from in the first place. Therefore, in the next step according to the above standard, the base station allocates a certain RACH resource to the relevant mobile station using the pre-sent access sequence, and the mobile station then sends an identification code for identifying itself to the base station through the RACH resource . Here, the allocation of RACH resources is realized via the so-called FPACH (Fast Physical Access Channel). Using this method, the base station can finally determine which mobile station sent the connection request signaling.

In the same mobile radio standard it is necessary to specify the orientation of the mobile station's position relative to the respective base station. Such orientation is possible if directional antennas are used within the base station. For this orientation, it is currently provided that the base station analyzes the signal on the UL DPCH (Uplink Dedicated Physical Channel) or on the PUSCH (Physical Uplink Shared Channel) for this purpose. These are the traffic channels on which the mobile station transmits useful data to the base station after establishing a connection, ie after signaling a connection request as described above. For such connection establishment, corresponding transmission resources (spreading codes, frequency bands, time slots) must be reserved for each mobile station. In the standard 3GPP TS 25.225, V5.1.0, Chapter 5.2.14 and TS 25.305, V5.4.0, Chapter 8, it is described to use UL DPCH or PUSCH to perform orientation.

Contents of the invention

The object underlying the invention is to carry out the above-mentioned orientation in another way.

This object is achieved with the method as claimed in claim 1 , the mobile radio system as claimed in claim 9 and the orientation device as claimed in claim 10 . Preferred refinements and developments of the invention are given by the subclaims.

For the method according to the invention for orienting the position of a mobile station relative to a base station in a mobile radio system operating according to mobile radio standards, it is provided that an access sequence is transmitted by the mobile station to the base station, and by means of Orientation is performed by the access sequence received by the base station. The access sequence here refers to one of a plurality of access sequences specified by the mobile radio standard, so as to be used by the mobile station to send connection request signaling to the base station,

A mobile station is here understood to mean any desired mobile radio station. A base station can be understood here to mean any other radio station, stationary or mobile. A mobile radio system is understood here to mean any radio system in which the described mobile stations and base stations are used. Mobile radio standards are here understood to mean the various standards used by one of the radio systems described, which specify an access sequence for connection request signaling.

Prior to orientation using the transmission resources assigned to the mobile stations, a connection is first set up according to the prior art described above, during which the invention advantageously makes it possible to perform orientation already before the transmission resources are allocated to the mobile stations. This can be achieved during the first access of the mobile station to the system when the mobile station is put into operation for the first time in the mobile radio system, since according to the invention the given direction uses the access sequence.

Compared with the prior art described at the outset, the present invention has the advantage that no transmission resources, such as time slots, frequency bands, spreading or scrambling codes, etc. need to be allocated for the service communication connection for orientation. Another advantage is that access sequences according to the UMTS-TDD standard, for example, can be transmitted in a time slot (UpPTS) specially reserved for this purpose, so that these access sequences only interfere with other access sequences and do not It will interfere with the traffic channel. However, by properly selecting access sequences, the interference between access sequences can be much smaller than the interference caused by traffic channels.

A further advantage of the invention is that orientation can already be performed before the channel is allocated to the mobile station. Thus, it is already possible, for example, to take into account the results of the orientation during channel allocation. If it is known that there is another base station that can still provide free resources in the determined direction, and the transmission resources of the base station to which the connection establishment request is directed are almost used up, then, in particular, simultaneous passage through the access sequence can be refused Connection request signaling issued.

According to a first embodiment of the invention, the access sequence sent by the mobile station is used both for orientation and for connection request signaling by said mobile station. Thus, sending the access sequence and receiving the access sequence within the base station are advantageously used for both purposes.

A further development of this embodiment of the invention provides for storing the result of the orientation performed by the base station and for storing the association from this result to the access sequence used for the orientation. The mobile station notifies the base station of an identification code that clearly identifies itself at a later point in time. A correspondence is generated from the identification code of the mobile station to the access sequence used for the orientation. Finally, a correspondence is generated from the stored results via the access sequence used for the orientation to the identification code of the mobile station. This approach can advantageously solve the following problem, that is, when a mobile station is first accessed to a mobile radio system by sending an access sequence, the base station does not know which mobile station it is at first, that is, what mobile station does the relevant mobile station have? kind of identification code. According to the invention, although an orientation has already been carried out at this point in time using the received access sequence, the ascertained orientation result cannot yet be assigned because the identification code is not known. The allocation is performed in the next step only after the mobile station communicates its identification code to the base station. Here, the identification code can be notified by retransmitting the previously used access sequence, so that the correspondence between the identification code and the orientation result can be realized simply.

Preferably, the mobile station can notify the identification code through the above-mentioned second step when the mobile station accesses the mobile wireless system for the first time. As mentioned above, this second step stipulates that the base station allocates a RACH resource to the mobile station according to the received access sequence, and the mobile station then transmits other information required for connection establishment to the base station on this resource. At this time, the information also includes the identification code of the mobile station. In addition, on the allocated RACH resources, the mobile station also transmits the same access sequence together with the information to the base station, so that a clear correspondence between the adopted access sequence and the identification code of the mobile station is realized . By using this method, a clear correspondence between the orientation result and the identification code of the mobile station can be realized.

According to a second embodiment of the invention, a radio cell is assigned to the base station, wherein a radio cell is understood to be the radio service area of the base station. In this embodiment, the access sequence used for the orientation is reserved exclusively for performing orientation at least in the radio cell of the base station, so that the access sequence is prevented from being used in the radio cell Send connection request signaling. This advantageously distinguishes the access sequences that are actually used in the radio cell for sending connection request signaling (as specified in the mobile radio standard) from those used for orientation Access sequences are distinguished. In particular, therefore, orientation can also be performed without connection request signaling—eg while a communication connection has already been established for the mobile station concerned. In this case, the reserved access sequences for specifically performing orientation are only set within a certain time delay, so that different ones of the access sequences can be reserved for this purpose at different points in time. Then, the remaining access sequences are respectively used by the mobile station to send connection request signaling.

According to a refinement of this embodiment of the invention, the access sequence used for orientation purposes is assigned to the mobile station by the base station. This is done before the mobile station sends the access sequence, which presupposes that the base station already knows the identity code of the mobile station. The base station can then specifically use the mobile station's identification code to inform the mobile station which access sequence it should transmit for orientation purposes.

According to an improved solution, the base station allocates a time point for sending the access sequence to the mobile station. This advantageously enables the same access sequence to be assigned to several mobile stations simultaneously for carrying out the orientation. The result of the orientation performed by means of the access sequence can then be assigned simply by taking into account the individual reception times of the access sequence within the base station. That is to say, by assigning different time points so that multiple different access stations transmit the same access sequence, different receiving time points will be automatically obtained in the base station, so that it can be realized from the orientation result through the receiving time point Correspondence between mobile station identification codes.

According to a further refinement, the base station assigns the mobile station a transmission power for transmitting the access sequence used for the orientation. In this way it can be ensured that the access sequence sent by the mobile station can reach the base station with a sufficiently high received power.

The mobile radio system according to the invention and the device according to the invention for orienting the position of a mobile station in a mobile radio system are designed in such a way that they carry out the method according to the invention and have the means required for this.

Description of drawings

Describe the present invention in detail below by means of the embodiment shown in the accompanying drawings, wherein:

Figure 1 shows a part of a mobile radio system,

Figure 2 shows a base station of the mobile radio system shown in Figure 1, and

FIG. 3 shows the contents of the memory of the base station shown in FIG. 2 .

Detailed ways

Figure 1 shows a part of a UMTS-TDD mobile radio system SYS. It goes without saying that the invention can also be applied to other mobile radio systems. FIG. 1 shows only one radio cell C of the mobile radio system SYS. This radio cell C belongs to the base station BS. In the radio cell C there is a mobile station MS and another mobile station MS1. Reference numerals shown in parentheses in FIG. 1 denote optional signals. A first embodiment of the invention is described in detail below, in which these optional signals are not transmitted.

As mentioned at the beginning of the article, the UMTS-TDD standard also specifies 8 different access sequences for each radio cell C to be used by the mobile station for connection request signaling to the base station. The mobile station MS in Figure 1 transmits one of the access sequences S to the base station BS for connection request signaling. The base station BS is equipped with a directional antenna A realized by an antenna field. By means of the directional antenna A, the base station BS is able to orient the position of the mobile station MS relative to the base station BS by determining the direction of incidence of the access sequence S. Directing the received signal by means of a directional antenna is well known to those skilled in the art and will not be repeated here. Each mobile station MS, MS1 sends one of said access sequences to the base station BS on a connection request. For this purpose, the base station broadcasts all 8 access sequences that need to be used in its cell C, and the mobile station randomly selects one of them. The mobile station MS transmits an access sequence S to the base station BS, and the other mobile station MS1 transmits another access sequence S1 to the base station BS. The base station BS performs the orientation described above for each received access sequence S, S1. In addition, the base station allocates transmission resources for the desired connection to each mobile station MS, MS1 in a subsequent step.

Fig. 2 shows the base station BS of Fig. 1 . Shown are only the important parts for understanding the invention. The base station BS has a transmit and receive unit TRx, which is connected to a directional antenna A. The transmitting and receiving unit TRx is connected to a signal processing unit SIG for processing the signals received via the antenna A and the signals to be transmitted via the antenna A. In addition, the base station BS has a device R for carrying out the orientation described above. The orientation device analyzes the access sequences S, S1 received via the antenna A and determines the direction in which the access sequences are incident on the antenna A. The corresponding results E, E1 of the orientation are stored separately for each received access sequence in the memory M of the base station BS.

The content of the memory M of FIG. 2 is shown schematically in tabular form in FIG. 3 . In this case, the memory M has a column entry for each mobile station MS, MS1 located in the radio cell C. FIG. The table in FIG. 3 shows the contents of the memory M at two different points in time t1, t2. At a first point in time t1, two access sequences S, S1 have been received by the base station BS from the two mobile stations MS, MS1 shown in FIG. 1 and orientations are respectively carried out. Both the access sequence S and (in correspondence with this access sequence) the corresponding results E, E1 are then stored in the memory. Subsequently, as specified in the UMTS-TDD-standard, each mobile station MS, MS1 that has given a signaling request by sending an access sequence is allocated a The RACH resource is used for the second step in the first access of the mobile station to the mobile communication system. In this second step, each mobile station MS, MS1 transmits to the base station BS an identification code K, K1 which unambiguously identifies the respective mobile station MS, MS1 (see FIG. 1). According to the standard considered here, the base station allocates a certain RACH resource to the mobile station to perform the second step, so the base station can clearly assign the identification codes K and K1 to the mobile station concerned in advance. Access sequences S, S1 sent by stations MS, MS1. According to FIG. 3, at a second point in time t2, corresponding identification codes K, K1 of the respective mobile stations MS, MS1 are then stored in the memory M of the base station BS in association with the orientation results E, E1. In this case, this assignment takes place via the access sequence S, S1 used in the first and second steps when the mobile station first accesses the mobile radio system.

Obviously, the orientation device R and the memory M shown in FIG. 2 may not be located in the base station BS, but may be contained in a unit located outside the base station BS, for example a central unit connected to a plurality of base stations of a mobile radio system, such as a base station controller.

In this first exemplary embodiment, each access sequence transmitted by the mobile station MS, MS1 in a first step when first accessing the mobile radio system SYS is directed by the base station BS.

Next, a second embodiment of the present invention will be described. In this regard, reference is made to the reference numbers shown in parentheses in FIG. 1 . In the radio cell C of the exemplary embodiment, in fact not all 8 access sequences specified for this by the UMTS-TDD-Mobile Radio standard, which are used by the mobile station to signal a connection request to the base station, are used. Instead, the two access sequences S, S1 used for orientation in FIG. 1 are reserved in this exemplary embodiment exclusively for carrying out the orientation described, so that it is not possible for the connection of the mobile station request signaling. Although the same access sequence can then be made available in another radio cell C of the mobile radio system, one of these access sequences which is identical to the radio cell C considered here must not be reserved. to perform orientation.

In this embodiment, the base station BS assigns a reserved access sequence S, S1 to each mobile station MS, MS1 that needs to be directed. Moreover, in addition to the access sequence S, S1 described, the base station BS also assigns to each mobile station MS, MS1 a transmission power P, P1 and a time point t, t1, wherein the mobile station should then use the above-mentioned power and The individual access sequences S, S1 are transmitted at the mentioned points in time. The base station BS then carries out the above-mentioned orientation by means of the access sequence S, S1 assigned to the mobile station MS, MS1 and subsequently sent by the mobile station to the base station BS.

In order to assign access sequences S, S1 to mobile stations MS, MS1 in the second embodiment, it is necessary for the base station to know the identification codes K, K1 of the respective mobile stations in advance. The base station BS can obtain this information via the two-stage first access method according to the UMTS-TDD standard described above with reference to the first exemplary embodiment. As shown in FIG. 1, in a second embodiment, said orientation is performed when a connection V, V1 for useful data transmission has been established between the mobile station MS, MS1 and the base station BS in the form of a traffic channel .

It is obvious that the described first and second embodiments can also be combined. The temporally preceding orientation can then be implemented simultaneously with the connection request signaling (according to the first exemplary embodiment) and subsequently (within an existing connection) updated according to the second exemplary embodiment.

Instead of sending the access sequence S at the time point T, T1, the base station BS can also inform the mobile station MS, MS1 that the mobile station should send the access sequence S, S1 several times, for example periodically, so that it can update each time the orientation.

As an alternative to, or in addition to, announcing the transmit power P, P1 for sending said access sequence S, S1 in the second embodiment, it may also be specified that: at the access sequence of the mobile station MS, MS1 In case of failure of the transmission attempts of S and S1, the transmission power for retransmission attempts is gradually increased by the mobile station respectively. By sending the access sequence S at the time point T assigned to the mobile station MS, the base station BS can unambiguously assign the received access sequence S to the mobile station MS without the mobile station having to transmit its identification code simultaneously with the access sequence K. This means that the base station BS knows which mobile station MS, MS1 it has allocated which access sequence S to transmit at which point in time T, T1. Therefore, through the receiving time point in the base station BS, the base station can easily determine from which mobile station MS, MS1 the access sequence S, S1 received each time comes from.

Claims (10)

1. be used for travelling carriage (MS) being carried out directed method with respect to the position of base station (BS) at mobile radio system (SYS) according to mobile radio standard work, wherein:

-stipulate a plurality of access sequences (S) by mobile radio standard, be used for sending the connection request signaling so that be moved platform to the base station,

-be transferred to base station (BS) to one in the described access sequence (S) by described travelling carriage (MS),

-and carry out orientation by the access sequence (S) that is received by base station (BS).

2. the method for claim 1, wherein:

The access sequence (S) that is sent by travelling carriage (MS) both had been used to carry out orientation, also was used for sending the connection request signaling by described travelling carriage (MS).

3. method as claimed in claim 2, wherein:

-storage by the result (E) of base station (BS) performed orientation and storage from this result (E) to being the corresponding relation that carries out the access sequence (S) that this orientation adopted,

-by travelling carriage time point (t2) afterwards an identification code (K) that identifies oneself clearly is notified to base station (BS),

-produce from the identification code (K) of this travelling carriage (MS) to being the corresponding relation that carries out the access sequence (S) that this orientation adopted,

-and, produce from the result (E) that stored through described to carrying out the directed access sequence (S) that is adopted again to the corresponding relation the identification code (K) of travelling carriage (MS).

4. the method for claim 1, wherein:

-distribute a wireless area (C) for base station (BS),

-and described is to carry out the access sequence (S) that this orientation adopted ad hoc to be reserved in this wireless area (C) at least to be used for carrying out orientation, sends the connection request signaling so that stop with this access sequence (S) in this wireless area (C).

5. method as claimed in claim 4, wherein:

Distribute the described access sequence (S) that adopts for directed purpose for described travelling carriage (MS) by described base station (BS).

6. method as claimed in claim 5, wherein:

Distribute a time point (T) to carry out described orientation for described travelling carriage (MS) by described base station (BS) to be used to sending access sequence (S).

7. as the described method in one of claim 5 or 6, wherein:

Distribute a transmitting power (P) to be sent as the access sequence of carrying out described orientation and adopting for described travelling carriage (MS) by described base station (BS).

8. as the described method of one of claim 4-7, wherein:

During the connection (V) of travelling carriage (MS) is led in existence, realize the transmission of described access sequence (S) and carry out directed by this access sequence.

9. mobile radio system (SYS),

-have at least one travelling carriage (MS) and a base station (BS),

-carrying out work according to mobile radio standard, this mobile radio standard has been set a plurality of access sequences so that being moved platform is used for sending the connection request signaling to the base station,

-this travelling carriage (MS) is transferred to base station (BS) to one in the described access sequence,

-and, have an orientation equipment (R), be used for travelling carriage (MS) being carried out orientation with respect to the position of base station (BS) by the access sequence (S) that receives from the base station.

10. be used for travelling carriage (MS) being carried out directed equipment (R) with respect to the position of base station (BS) at mobile radio system (SYS) according to mobile radio standard work, described mobile radio standard has been set a plurality of access sequences so that being moved platform is used for sending the connection request signaling to the base station, this equipment by send from travelling carriage (MS) and carry out described orientation by the access sequence (S) that base station (BS) receives.

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