JP2003503922A - Mobile and base station assisted network-evaluated handover - Google Patents

Abstract

(57) [Summary] A telecommunications system in which handover is performed and details thereof are determined based on the state of the uplink and downlink between a mobile station and a neighboring cell base station. The mobile station reports the downlink status of the neighbor cell to the network commanding the neighbor cell to report the uplink status from the mobile station. The network reports the handover specification and the mobile station power level based on the uplink and downlink status information.

Description

Detailed Description of the Invention

FIELD OF THE INVENTION The present invention relates to wireless communication systems, and more particularly to methods and apparatus for achieving effective handover of wireless terminals between adjacent cells.

[0002] In a typical cellular radio system, the geographical area is divided into cell areas served by base stations connected to the radio network. Each user (mobile subscriber) of a cellular radio system is provided with a portable, pocket, handheld or on-board mobile station for voice and / or data communication with a mobile communication network. Each base station includes multiple channel units including transmitters, receivers and controllers, and omnidirectional antennas for equal transmission in all directions, or multiple directional antennas each serving a particular sector cell. It may be equipped with a sex antenna. Each mobile station also includes a transmitter, receiver, controller, and user interface, and is identified by a particular mobile station identifier. The first public mobile communication systems were in the late 1970s and 19
It was introduced in the early 1980s. These are the famous systems called the first generation. They include AMPS in the United States, NMT in Scandinavia, TACS in the United Kingdom and NAMTS in Japan. They have certain transmission characteristics that are common to all, such as analog frequency modulation with wireless and digital control in networks. Otherwise, it would have adopted a communication standard specific to that system compared to others.

In a conventional analog cellular system, when the mobile station is idle (not using the traffic channel), the terminal continuously monitors the control channel corresponding to the current cell in the network. As a result, the mobile station can continuously determine if a page message addressed to it has been received on the control channel. If received, the mobile station sends a page response to the base station via the control channel, and the base station forwards the page response to the wireless network. In response to receiving the page response, the wireless network selects an available voice channel within the cell that sent the page response and queues the mobile station over the control channel to establish a through connection. Request to the cell base station.

In addition, by dialing a telephone number or pressing the "send" button on the telephone handset, the mobile station may access the network to initiate a call. Control signals, including the mobile station identifier and the telephone number to be dialed, are transmitted over the control channel to the base station, which activates the mobile station, assigns traffic channels, and is forwarded to the wireless network establishing the through connection.

If the mobile station moves between cells while the connection is established, a "handover" of the connection occurs between cells. Handover can occur as a result of various changes that occur in the communication between the mobile station and the network. One common handover occurs when a mobile station is in communication with a single base station serving the cell in which it is currently located. When the mobile station moves from the cell to a new cell served by a new base station, the first base station hands over the communication to the new base station. Thus, as the mobile station moves between cells served by each base station, it terminates communication with the first base station and begins communication with the second base station.

In another type of handover, a mobile station may receive redundant communications from multiple base stations to ensure transmission quality. For example, in FIG. 1, wireless network core 100 receives communication 102 from a network (not shown). The communication 102 is aimed at the mobile station MS via the established traffic channel TCH. The radio network core 100 transmits the communication 102 to a diversity handoff DHO entity 101, which splits the signal 102 into redundant messages for the base stations BS1 and BS2. Base stations BS1 and BS
2 transmits the communication to the mobile station MS via the same traffic channel TCH. Various techniques are known for providing the diversity handoffs described above.
Since the mobile station receives the message on the traffic channel TCH via the redundant communication, the mobile station receives the message by appropriately selecting the traffic channel signal or by combining the signals received on the traffic channel according to a known protocol. The quality (conversely, transmission quality) can be improved.

[0007] As the mobile station moves from point A to point B, the transmission / reception quality with the base stations BS1 and BS2 changes. The mobile station MS and the current base stations BS1 and BS2 may, at some point in the communication, use the various base stations B
You may benefit from the addition of S3. That is, it can be said that the mobile station MS is in communication with the current base station group (BS1 and BS2) and has an available neighboring base station BS3 for establishing a communication link in the future.

In the process of moving from point A to point B, the base station 2 maintains communication with the mobile station MS as a whole, and the base stations BS1 and BS3 maintain communication according to the signal quality. Good or not required to maintain. In FIG. 1, the mobile station is
It communicates using the traffic channel TCH regardless of the base station with which it communicates.

The mobile station may (or may be instructed to) test neighboring cells to maintain a record of the current base station and include it in the record. Depending on the situation, base stations in the current communication are added or excluded from the current record.

As shown in FIG. 2, handoffs occur even within the range of a single base station. There, the base station has four antennas A1 to A4 that define four geographical coverage areas. The mobile station MS communicates with the base station BS at the point A via the traffic channel TCH. At point A, the mobile station has antennas A1 and A4
To the base station by redundant reception / transmission to / from. However, after moving to the point B, the mobile station MS may start transmission / reception with the antennas A1 and A2. As the mobile station moves from point A to point B, the handoffs are A1 / A4 and A1 / A2.
It occurs between the antennas.

Diversity reception / splitting as shown in FIGS. 1 and 2.
g) is uninterrupted communication between the base station and the mobile station (in the case of FIG. 2) and between the wireless network and the mobile station (in the case of FIG. 1). That is, in the case of FIG. 1, the mobile station MS always communicates with the wireless network core via the base station 2 regardless of whether the mobile station MS moves from the point A to the point B or is handed off from the base station 1 to the base station 3. maintain.

Handoff scenarios occur as a result of the existence of certain conditions, such as the signal strength between the mobile station and the receptor. For example, in the case of FIG. 1, as the mobile station moves from point A to point B (as indicated by the dashed line in FIG. 1), the signal strength between mobile station MS and base station BS3 is communicated with BS1. It may be decided that it is preferable to communicate with BS3 rather than to. In the conventional handoff scenario, either the mobile station MS or the base station (BS1 to BS3)
The current radio communication conditions between the mobile station and the neighboring cells (often measured and reported by the MS) and the resource conditions (which qualify the free channels in the cell indicated by the MS measurements) were measured. In the typical case today, the MS measures the cell condition and reports the result to the network which evaluates the handover in terms of required resources. However, this raises the problem that facilitating handoffs from the perspective of the network may not be facilitating handoffs from the perspective of the mobile terminal. That is, the network may request a handoff as a result of the signal condition, but the mobile station may evaluate the handoff condition differently and vice versa. If the network makes a handoff decision, the handoff is performed without considering the state of the mobile station. On the other hand,
If the mobile station makes a handover decision, the handover is performed without considering the network conditions.

In the present invention, both the uplink signal from the mobile station and the downlink signal to the mobile station and the radio communication network are included in the handover evaluation. The invention has particular utility whenever the uplink and downlink conditions are different in one network, or when the mobile station is adjacent to the boundary of two different network operators. In such case, the measurement report related to the handover from the mobile station is transmitted to the wireless communication network and used by the network to determine when the base station should measure the uplink transmission quality from the mobile station. May be. Both measurements are used to make handoff decisions.

The present invention allows the BS to make some measurements on the MS in parallel with the MS measuring on the BS. Also, some BSs listen to the uplink without transmitting anything on the downlink, other than utilizing existing downlinks from other BSs to send power control commands. to the
uplink).

The invention also makes it possible to collect channel and / or power level uplink conditions in the network before a wireless handover to the broadcast area of a new cell.

The above and other objects, features and advantages of the present invention will be apparent from the accompanying drawings and the following description of preferred embodiments. Corresponding components are provided with the same reference numbers in the figures. While many of the drawings show functional blocks and components individually, those of ordinary skill in the art will appreciate that these functions may be implemented by individual hardware circuits, appropriately programmed digital microprocessors, ASICs, and / or one or more DSPs. You will understand that it may be realized.

DETAILED DESCRIPTION OF THE DRAWINGS In the following description, for the understanding of the present invention, specific details such as specific embodiments, data flows, signaling implementations, protocols, techniques, etc. are set forth. These are for purposes of explanation and not limitation.
However, one of ordinary skill in the art will appreciate that the invention can be practiced in other embodiments without departing from these specific details. Also, detailed descriptions of known methods, interfaces, devices, and signaling techniques are omitted to avoid obscuring the description of the present invention based on unnecessary details.

The present invention is not limited to the application to the UMTS (universal mobile telecommunications) 10 of FIG. An alternative and connection-oriented external core network, shown at 12 in FIG. 4, is, for example, the public switched telephone network (PSTN).
And / or an Integrated Services Digital Network (ISDN). An alternative and connection-oriented external core network, shown at 14 in FIG.
For example, it may be the Internet. Both core networks are paired with a corresponding service node 16. The PSTN / ISDN connection oriented network 12 is connected to connection oriented service nodes, shown as mobile switching center (MSC) nodes 18 that provide circuit switched services. In the existing GSM model, the MSC 18 is connected via interface A to a base station subsystem (BSS) 22 which is connected to the radio base station 23 via interface A ′. A connectionless oriented network 14, such as the Internet, is connected to a general packet radio service (GPRS) node 20 that is configured to provide a packet switched type service, sometimes referred to as a serving GPRS service node (SGSN). Each of the core network service nodes 18 and 20
It is connected to the UMTS Terrestrial Radio Access Network (UTRAN) via a Radio Access Network (RAN) interface. UTRAN 24 includes one or more radio network controllers 26. Each RNC 26 is a base station (BS) within the UTRAN.
28 and other RNCs.

[0019] Preferably, the wireless connection is based on Wideband Code Division Multiple Access (WCDMA), where individual wireless channels are assigned using CDMA spreading codes. Of course, other connection methods may be adopted. WCDMA offers wide bandwidth for multimedia services and other high transfer rate requirements, as well as diversity handoff and RAKE receivers to ensure high quality. The mobile station 30 uses the transmit code so that the base station 28 can identify the transmission from that particular MS 30. In the current WCDMA standard, codes are scheduled to be assigned to dedicated channels as follows.

A) Uplink and downlink transmissions are channelized codes (chan)
nelization codes), the top of which is a scrambling code.
) Is used.

B) The channelization code determines, for example, a spreading factor, and the spreading factor determines the maximum bit rate.

C) Mobiles in the same cell using the same frequency and the same spreading factor use different channelization codes for the downlink channel, but use the same scrambling code.

D) Mobiles of other cells use the same channelization code but different scrambling codes.

The scrambling code guarantees the integrity between downlink transmissions that utilize the same channelization code in different cells. The scrambling code used in the uplink guarantees integrity between uplink transmissions from different mobile stations in the same or different cells.

Thus, the MS obtains its own scrambling code, while the BS transmissions for a particular mobile in the dedicated channel use a common scrambling code and a single channelization code. Ah The MS has the ability to combine downlink transmissions with different scrambling codes and different channelization codes (one constraint today is that the spreading factors of the channelization codes must be the same for all cells). That is not the case.)

The radio network controller 26 and the base station 28 shown in FIG. 5 perform corresponding data processing and data processing to perform a number of radio and data processing operations required for communication between the RNC 26 and the mobile station 30. A wireless network node including control units 32 and 33. The device part controlled by the base station data processing and control unit 33 comprises a plurality of radio transceivers 3 connected to one or more antennas 35.
Including 4. The mobile station 30 shown in FIG. 6 also includes a data processing and control unit 36 for controlling various operations required by the mobile station. The mobile data processing and control unit 36 provides control signals as well as data to a wireless transceiver 37 connected to an antenna 38. The data processing and control unit 36 and the transceiver 37 are powered by the battery 39. By the battery 39,
The amount of power supplied to the data processing and control unit 36 and the transceiver 37 is adjusted by one or more control signals from the data processing and control unit 36.

The present invention is based on, for example, the radio network controller 26 and the base station 28 shown in FIG.
May be adopted in the context of the mobile communication system 10 forming a wireless connection network between the core network node (such as the MSC 16) and the mobile station 30. In previous handover scenarios, the mobile station performed a radio condition assessment and the network performed a resource assessment to determine if a handover should occur. The resulting underlying problem is an overpowered (insufficient) condition in which the MS broadcasts with a signal strength that is too strong or too weak for the conditions in neighboring handover cells. The present invention, on the other hand, allows the network to make measurements instead of (or more preferably) in parallel with the measurement report received from the mobile before the network sends the handover command.

FIG. 3 shows these states in more detail. When the mobile station MS is in position A, the traffic channel TCH provides an uplink from the mobile station MS to the base station BS1 and a downlink from the base station BS1 to the mobile station MS. The communication quality between the mobile station and the base station is defined by referring to both the uplink state and the downlink state. As the mobile station moves to point B, a handoff decision would have to be made between base station BS1 and base station BS2. To ensure high quality communication, the handoff decision is made by the mobile station and the base station BS1.
And the uplink and downlink communication quality between the mobile station and the base station BS2.

In particular, if the handoff between the base station BS1 and the base station BS2 is performed only by the network, the network verifies the downlink condition between the mobile station MS and the base station BS1 or the base station BS2. Do not have. Current protocols allow the network to perform a resource assessment regardless of whether the MS or BS has performed a radio condition assessment. That is, the MS may report the radio condition information for use in the network in the handoff evaluation, and the BS may provide the radio condition evaluation based on the uplink condition. The radio condition information is used for the pathloss estimation (pathloss est measured by the MS.
imates), but the information is
Can be systematically measured.

Referring now to FIGS. 1-3, a preferred embodiment of the present invention comprises a mobile station reporting to the RNC 100 regarding the downlink profile that the RNC utilizes to direct handoff operations. The MS will utilize the BCCH channel to measure for the cells with which it is communicating (cells in the active set). At point A, the MS keeps a record of the current base station with which it is communicating. The MS also continuously monitors the quality of the downlink signal for neighboring cells based on the reception quality of the common pilot channel. Alternatively, any channel that has a constant output power and covers the entire cell, including pilot bits, can be used for neighbor cell measurements. In this way, since the MS moves from the A point to the B point, the MS sends the BCH from the BS3.
Measure downlink conditions. The MS reports the measurement profile from the downlink to the RNC 100 whenever the profile from the neighbor cell exceeds the criteria. The RNC notifies the base station, such as BS3, that the MS has identified the base station as the base station in the current or near-term communication. The RNC 100 instructs the BS3 to measure the uplink transmit power it receives from the MS as it moves from point A to point B. If the mobile station transmits at high power (uplink) as reported by the base station and the mobile station receives at high power as reported by the mobile station at base station BS3 (neighboring cell). (Downlink), the RNC 100 utilizes the existing link between MS-BS1 and MS-BS2 to instruct the mobile station to reduce the power level to a level that does not interfere with the cell defined by BS3. Due to the temporary reduction of the MS output power, the BS3 uplink is protected from excessive interference until the radio link is established between the MS and BS3 with full support for fast power control.

The base stations BS1 and BS2 continue to communicate with the mobile station MS via the already established transmission channel TCH. Between MS and BS3, only power control is initially provided until BS3 reports to the RNC 100 that the uplink has reached the appropriate level. Then the RNC 100 causes the MS to include BS3 in the current report (or, if the mobile station cannot accept more base stations, discards the weakest base station from the current report,
Notify that a handoff should be set up (to replace S3). Of course, the RNC 100 informs the mobile station to reduce its transmit power to an appropriate level so that the mobile station includes BS3 in the current report of the base station communicating on the TCH.

It is possible to have BS3 receive the uplink and combine this uplink with BS1 and BS2 long before BS3 is instructed to start transmitting on the downlink. As a result of combining the uplinks from BS 1, 2 and 3, the MS can reduce its power. This is typically accomplished by changing the signal-to-interference ratio target for BS1 and BS2, since BS1 and BS2 have fast power control connections with the MS on the downlink.

In general, the preferred embodiment of the present invention eliminates any link that weakens both the downlink and the uplink. The mobile station is kept in an active communication set with the base station. There, a strong uplink is paired with a weak downlink (or vice versa), low path loss and low disturbance (a factor that allows low power to be used to reach target quality). ). After all, with the possible power reduction instructions given to the MS by the RNC, the strong uplink and downlink signals ensure that the communication between the mobile station and the base station continues.

According to an embodiment of the present invention, the mobile station reports the BCH power level of all neighboring cells as to whether the signal is weak or strong. The RNC utilizes the measurement results from the mobile station to determine when to measure the uplink information sent by the mobile station based on the reported downlink information. Handoff is triggered when the uplink information reaches a threshold. Other reasons for initiating BS measurements are because the BS is subject to high interference levels, or the MS output power is nearing its limit, or because BS members in the active set are consuming power. . Another reason may be that the frequencies used by the MS are overloaded and the MS has to be handed over to another frequency. The BS measures for the MS and determines which B after the frequency changes if the other frequency is not supported by all cells in the area.
Evaluate whether S should be used by the UE (user equipment). When the BS measures the MS, the MS is identified by a unique scrambling code. As a result of BS measurement, the MS is identified by its single scrambling code. And the system should be able to make more reliable inter-frequency handover decisions.

FIG. 7 shows that when a mobile station moves within the geographical range of BS1, BS2 and BS3,
6 shows a comparison of signal quality (downlink) received by a mobile station from various base stations. Initially, the mobile station conducts voice communication only with BS1 (and BS2 and BS2).
The downlink status from 3 may be monitored. ). BS2 and BS3 are not included in the mobile station's current base station active set. However, the mobile station continues to report to the RNC 100 what the downlink signal strengths of the neighboring cells BS2 and BS3 are. At time t1, the signal strength of the BS2 downlink is reduced to the threshold (Δ
CS) has been reached. This can be regarded as a request for renewal (IS95
In, the request is more explicit, "MS gives the network an offer that it cannot reject." ).

The mobile station continues to test the downlink signal strength from BS3. When the downlink signal strength from BS3 exceeds the neighbor cell set threshold ΔNS, the mobile station reports that BS3 is a candidate for inclusion in the mobile station's current set. For hard handover, the RNC informs BS3 to evaluate the uplink conditions and to report on possible interference and power level conditions. The RNC reports back to the MS when the connection with BS3 was initiated and at what power level. RNC has proper handover specifications for MS (and proper power level) and MS
Informs that it has detected the ΔCS downlink threshold from BS3, BS3 is added to the current report. Due to the soft handover, the MS does not explicitly adapt the power, but if the power control bits transmitted on the active set downlink indicate that the MS power should be reduced.

FIG. 8 shows another embodiment of the invention that provides an advantageous application. In FIG. 8, the mobile station MS1 starts uplink and downlink communications at point A on the TCH with the base stations BS1, BS2 and BS3. The MS thus has the current communication set equally for BS1, B2 and BS3. The mobile station MS1 monitors the BCHs from BS4 and BS5 and finally adds them to the proposed neighbor cells. However, there are problems with adding BS4 and BS5 to the current report. For BS4, the signal strength is too strong and should be reduced as soon as possible. If BS4 detects a high signal, it instructs BS1, BS2, and BS3 to lower their signal-to-interference ratio targets, thereby promptly powering down the MS to avoid disturbing BS4. Can be forced using the fast power control bit. It is also beneficial if the BS4 uplink is included in the DHO that combines at the same time to compensate for the reduced UE uplink power. If deemed appropriate by the network, the BS4 downlink will be started and the MS will
The active set is updated. For BS5, MS communication on TCH is T
It results in unacceptable interference to the already established communication between MS2 and BS5 on the CH 'channel.

If the mobile station MS1 decides, independently of the network, to perform the handoff based solely on the comparison of the downlink signal strengths between BS1, BS2, BS3 vs. BS4 and BS5. MS power overwhelms BS4, BS5
Communication will be blocked on the uplink side as it will interfere with existing communication in. On the other hand, according to the preferred embodiment of the present invention, the MS 1 is
As it moves to the point, it detects the BCH downlinks from BS4 and BS5 and reports to the network when each of the neighboring base stations exceeds the ΔNS. When the threshold is reached, the network does not immediately command the handoff procedure, but signals the base station to perform an uplink evaluation. Depending on its operation, the base station BS4 or BS5 detects a power level problem or interference condition and reports it to the network. If BS4 and BS1,2,3 are operating on the same frequency, the handover is done for all other Ms using BS4.
It should be regarded as an early power control done to penalize this MS in the interest of S. If the MS power is reduced, BS5 is no longer affected by this MS. RNC
Waits for further downlink information about other neighboring cells coming from the mobile station.

FIG. 9 is a diagram showing a further embodiment for effectively utilizing the present invention. In FIG. 9, the mobile station is served by an operator 1 located to the left of the boundary of the figure, and once moved to point B, is served by a different operator, operator 2, located to the right of the boundary. In cell 1 of operator 1, the uplink of mobile station MS is F1. If the mobile station moves to cell 2 of operator 2, the uplink of the mobile station on frequency F1 will interfere with other transmissions. Applying the present invention, the current list (base stations exceeding ΔCS threshold) is generated by the MS for operator 1 and by detecting the BCH downlink of the operator 2 cell, the neighbor list for operator 2 (ΔNS threshold is (Exceeding base stations) are generated. This information, which instructs the base station of cell 2 to measure the uplink from the mobile station MS, is reported to the RNC of operator 2. This uplink measurement reveals a high signal strength from a particular MS, so cell 2 is subject to interference from this MS as long as this MS is connected to cell 2. RNC of operator 2
Reports to the RNC of operator 1 that the neighbor list will not allow the frequency F1 in cell 2 to the mobile station. At least the following three options are possible after receiving the information from the operator 2.

1. Inter-operator handover from cell 1 (operator 1) to cell 2 (operator 2).

2. While performing inter-frequency handover, stay with operator 1.

[0042]   3. Limit the output power.

If the above approach 1 is selected, the RNC of operator 1 issues a request to perform a handover from cell 1 to cell 2 and the RNC of operator 2
Instructs the BS in cell 2 to measure the user entity and responds to the handover request based on the measurement result.

The present invention has been described in relation to what is presently considered the most practicable and preferred embodiment. On the other hand, the invention is not limited to the disclosed embodiments, but on the contrary, all of the various modifications and equivalent substitutions included within the spirit and scope of the invention as claimed. To cover.

[Brief description of drawings]

[Figure 1]   It is a block diagram which shows the outline of a mobile radio communication system.

[Fig. 2]   It is a block diagram which shows the outline of the communication system from a mobile station to a base station.

[Figure 3]   FIG. 3 is a block diagram showing a communication link from a mobile station to a base station.

[Figure 4]   It is a block diagram which shows the outline of a mobile radio communication network.

FIG. 5 is a block diagram showing an outline of a configuration of a wireless network control device connected to a base station.

[Figure 6]   It is a block diagram which shows the outline of a structure of a mobile station.

FIG. 7 is a graph of thresholds for the current set and adjacent sets employed in an embodiment of the invention.

FIG. 8 is a schematic block diagram of a mobile communication system in which a mobile station communicates with different base stations on the uplink and the downlink.

FIG. 9 is a block diagram corresponding to an embodiment when the present invention is used across different boundaries between different operators.

─────────────────────────────────────────────────── ─── Continued front page    (81) Designated countries EP (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, I T, LU, MC, NL, PT, SE), OA (BF, BJ , CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG), AP (GH, GM, K E, LS, MW, MZ, SD, SL, SZ, TZ, UG , ZW), EA (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM), AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, C H, CN, CR, CU, CZ, DE, DK, DM, DZ , EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, K G, KP, KR, KZ, LC, LK, LR, LS, LT , LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, S D, SE, SG, SI, SK, SL, TJ, TM, TR , TT, TZ, UA, UG, UZ, VN, YU, ZA, ZW F term (reference) 5K022 EE02 EE21 EE31                 5K067 AA23 BB04 DD41 EE02 EE10                       EE16 EE24 JJ71

Claims (17)

[Claims] 1. A method in a telecommunications system having a plurality of mobile stations, the method comprising: communicating with at least one current base station via one of the mobile stations; Measuring a broadcast channel downlink characteristic from at least one adjacent base station and reporting when the characteristic downlink reaches a predetermined downlink state; and in the network, from the one mobile station to the adjacent base station. Determining a corresponding radio uplink condition to the mobile station, and determining which of the free channels is suitable for the one mobile station based on the measured downlink characteristics and the corresponding radio uplink condition. For evaluating the free channel of the adjacent base station, From the work to the mobile station, reporting a handover event specification and a power level of the mobile station based on the uplink state and the downlink state, and the one of the one based on the handover event specification and the power level. Handing over a mobile station to the neighboring base station. 2. The method according to claim 1, wherein the handover is a soft handover. 3. The method of claim 1, wherein the handover is an inter-operator handover. 4. The method of claim 2, wherein the mobile station maintains communication with the current base station after the handover. 5. The predetermined downlink condition is based on a first threshold associated with a downlink signal level between the one mobile station and the current base station. The method described in. 6. The uplink condition includes signal strength, signal-to-noise, path loss,
Method according to claim 1, characterized in that it is a measurement quality consisting of a group consisting of a time difference and a round trip delay. 7. The uplink condition is signal strength, signal-to-noise, path loss,
Method according to claim 5, characterized in that it is a measurement quality consisting of a group consisting of a time difference and a round trip delay. 8. A node in a telecommunications system including a mobile station, comprising: 1) information from the mobile station irrespective of the radio downlink signal conditions of the neighboring cell and the correspondence provided by the mobile station to the neighboring cell. A transmission / reception circuit that transmits and receives information from the adjacent cell regardless of the radio uplink signal state, and an appropriate communication channel and mobile station power level based on the downlink signal state and the uplink signal state And an electronic data processing and control circuit for communicating the handover event specification with the mobile station in order to determine a handover event specification including: and facilitate the handover by the mobile station to the adjacent cell. A node comprising :. 9. The node according to claim 8, wherein the handover is a soft handover. 10. The node according to claim 8, wherein the handover is a hard handover. 11. The node according to claim 8, wherein the downlink signal condition is based on a first threshold. 12. The node according to claim 8, wherein the uplink signal condition is a measurement quality consisting of a group consisting of signal strength, signal-to-noise, path loss, time difference, and round trip delay. . 13. A telecommunications system comprising: a mobile station; a current base station communicating with the mobile station on a traffic channel; and a neighbor base station, the mobile station being a broadcast channel of the neighbor base station. A neighboring base station monitoring the current and neighboring base stations, the mobile station reports when the monitored broadcast channel reaches a predetermined neighboring cell downlink state, A neighbor cell reports a corresponding uplink condition from the radio station, the network determines a handover event specification and a power level determined based on the reported downlink condition and uplink condition;
A telecommunications system, wherein the mobile station reports to the mobile station so that the mobile station will hand over to the adjacent cell. 14. The telecommunication system according to claim 13, wherein the handover is a soft handover. 15. The telecommunication system according to claim 13, wherein the handover is a hard handover. 16. The telecommunications system of claim 13, wherein the downlink signal condition is based on a first threshold. 17. The telecommunications of claim 13, wherein the downlink condition is a measurement quality consisting of a group consisting of signal strength, signal-to-noise, path loss, time difference and round trip delay. system.