CN118678415A

CN118678415A - Method and apparatus for radio communication

Info

Publication number: CN118678415A
Application number: CN202310252999.8A
Authority: CN
Inventors: F·A·席格; K·S·哈桑
Original assignee: Robert Bosch GmbH
Current assignee: Robert Bosch GmbH
Priority date: 2023-03-15
Filing date: 2023-03-15
Publication date: 2024-09-20

Abstract

A method and apparatus for radio communication. A method is provided, comprising: deactivating (110) a sleep mode of a device; transmitting (114) position information after deactivation of the sleep mode if an associated contribution indicator indicates that the position information is suitable for contributing to the determination of the position of at least one other device; and activating (104) the sleep mode after transmission of the position information.

Description

Method and apparatus for radio communication

Technical Field

The present description relates to advantages in radio communications.

Disclosure of Invention

The problem of the prior art is solved by a method according to claim 1, by at least one device of the other independent claim and by at least one further method according to the other independent claim.

Aspects of the present description are directed to the following subject matter: a method, comprising: deactivating a sleep mode of the device; transmitting the location information after the sleep mode deactivation if the associated contribution indicator indicates that the location information is suitable for contributing to determining the location of the at least one other apparatus; and activating a sleep mode after the transmission of the location information.

Advantageously, parked vehicles that wake up to sleep are used as precision positioning enhancers using side-chain positioning. Parked vehicles wake up, adapt and provide their positioning, and then use the side chain positioning to assist other vehicles in calculating/enhancing their positioning. Advantageously, power saving is enabled and wakeups are handled carefully and in a timely manner to allow for adequate wake-up periods and to allow for SL positioning measurements.

Advantageously, a wake-up strategy for side chain positioning evaluation is provided, which enables better power saving. In particular, parking the vehicle may assist in moving the vehicle by transmitting location information while, at the same time, providing power savings through sleep mode.

An advantageous example is characterized in that the location information and the associated contribution indicator are updated after the sleep mode deactivation if the contribution indicator indicates that the location information is not suitable for contributing to the determination of the location of the at least one further apparatus.

For example, the contribution indicator control indicates lower layers that are sufficiently triggered for the wake-up sleep receiver, i.e. in combination with other metrics. However, setting the contribution indicator may involve higher layers, especially when the spatial location (X, Y, Z) is compared to the confidence value. This means that the satellite position, CLM container and ranging/angle contribution received from higher layers are analyzed. This may be done in higher layers. Thus, the higher layer calculates the value of the contribution indicator, sets the contribution indicator to one of the levels it may take, and then it sends the contribution indicator to the lower layer to control the wake-up process for location accuracy enhancement.

Advantageously, if the contribution of the transmission location information is expected to be low, an update is triggered. In other words, once the UE wakes up, precise positioning adaptation is performed, which enhances the location information of the UE.

An advantageous example is characterized in that the updating of the location information and the associated contribution indicator is based on at least one or more of: at least one remote location information characterizing a spatial location of another device and having been received; at least one satellite information characterizing at least a signal propagation delay between the satellite and the device, and having been received; and at least one distance information characterizing a relative distance between the device and another device.

An advantageous example is characterized by receiving or determining or reading a wake-up pattern characterizing at least a plurality of moments in time at which at least the receiver circuit is woken up; if the wake pattern indicates the end of the sleep mode, the sleep mode is deactivated.

An advantageous example is characterized by receiving or determining or reading a wake-up opportunity pattern characterizing at least a plurality of time periods during which at least the receiver circuit is awake; monitoring a radio channel for receipt of a wake-up indication or signaling during at least one time period; and if a wake-up signal is received during at least one time period, the sleep mode is deactivated, or if a wake-up indication or signaling is not received during at least one time period, the sleep mode is activated.

An advantageous example is characterized by receiving at least one wake-up signal comprising a transmission request.

An advantageous example is characterized by receiving at least one wake-up signal (WUS # 1), wherein the wake-up signal itself or a subsequent signal comprises a transmission request (TxR), wherein the transmission request comprises a side chain positioning request signaling, wherein the receiver uses the side chain positioning request signaling to measure a physical distance range between said receiver and a transmitter transmitting the side chain positioning request.

Advantageously, the triggering means (such a receiver of the side chain positioning request) measure the distance range and/or the position angle between said receiver means and the transmitter node transmitting said side chain positioning request during the wake-up time by means of physically measuring the time of flight (ToF) and/or the angle of arrival/departure (AoS/AoD) and/or the Phase and Amplitude Change (PAC) of the side chain positioning request signal.

Advantageously, the device (such a receiver of side chain positioning requests) is triggered to transmit a response to a side chain positioning transmission request; wherein the response incorporates a side chain distance range and/or position angle between the requesting transmitter and the receiver, wherein the value is incorporated into the physical transmission waveform or lower layer message during the wake-up time.

An advantageous example is characterized in that a receiver receiving a side chain positioning request from a transmitter measures the distance and angle to said transmitter, wherein the receiver sends measurements to its upper layer during a wake-up time to enhance the positioning of said transmitter.

Advantageously, the device is triggered by a transmitted transmission request to transmit location information in its vicinity.

An advantageous example is characterized by receiving at least one further wake-up signal comprising an update request, wherein the updating of the location information and the associated contribution indicator is performed upon receipt of the update request.

Advantageously, the device is triggered by a transmitted update request to update its own location information. Thus, a management mode for the UE is provided.

According to an example, the lower layer update request is a side chain positioning request, the side chain message/signaling containing side chain positioning reference symbols (SPRS).

According to an example, higher layer update requests, when the UE wakes up and wakes up its computer/GPP, the UE receives CLM messages or CLM update requests, which require a reply from higher layer signaling. In the latter case, the RX/TX wakes up and is ready to carry those higher layer messages back with its lower layer mechanisms (of RX/TX).

An advantageous example is characterized in that the deactivation of the sleep mode is based on at least one of the following: a contribution indicator; and the number of skipped wake-up opportunities.

Advantageously, the deactivation of the sleep mode is controlled by a contribution indicator indicating how much the currently determined location information can contribute in terms of the accuracy of the determination at other UEs in the vicinity. Activating the transmitter and receiver circuits based on the number of skipped wake-up opportunities has the following advantages: on the one hand, the energy consumption is reduced, but on the other hand, the UE will still contribute at least every nth wake-up opportunity.

An advantageous example is characterized by monitoring traffic on a radio channel; determining a transmission pattern indicating at least a plurality of time instants for transmission of the own location information based on the monitored traffic; and the transmission of the location information is based on the transmission pattern.

An advantageous example is characterized in that the sleep mode is deactivated if the contribution indicator indicates that the location information is not suitable for contributing to the determination of the location of the at least one further apparatus.

Advantageously, the sleep mode ends to update the location information.

An advantageous example is characterized by monitoring traffic properties on a radio channel; wherein the contribution indicator is updated based on the monitored traffic attributes.

Advantageously, the contribution indicator increases or decreases inversely proportional to the location information available on the monitored radio channel. Thus, unnecessary traffic on the radio channel is avoided.

An advantageous example is characterized in that the updating comprises determining a precision indicator indicating an accuracy of the determined location information; a contribution indicator is determined based on the precision indicator.

Advantageously, the position information is only transmitted if a certain confidence level is reached in terms of accuracy.

Another aspect of the present specification is directed to the following subject matter: an apparatus comprising a deactivation means for deactivating a sleep mode of the apparatus; transmitting means for transmitting the location information after the sleep mode deactivation if the associated contribution indicator indicates that the location information is suitable to contribute to a determination of a location of at least one other apparatus; and an activating means for activating the sleep mode after the transmission of the location information.

Additional aspects of the specification are directed to the following subject matter: a method comprising monitoring a radio channel for a radio situation; determining a wake-up configuration for the remote device, wherein the wake-up configuration is determined based on the monitored radio conditions; and transmitting a wake-up configuration.

An advantageous example is characterized in that the wake-up configuration comprises at least one of the following: a transmission pattern indicating at least a plurality of times at which at least one remote device should transmit location information; and a wake-up pattern characterizing at least a plurality of moments in time at which at least a transmitter circuit of at least one remote device is woken up.

Aspects of the present description are directed to the following subject matter: an apparatus, comprising: monitoring means for monitoring a radio situation of a radio channel; determining means for determining a wake-up configuration of the remote device, wherein the wake-up configuration is determined based on the monitored radio conditions; and a transmission means for transmitting the wake-up configuration.

Drawings

FIG. 1 depicts a flow chart of an operation control unit;

fig. 2a, 2b each depict the structure of an apparatus comprising a control unit;

FIG. 3 depicts an example of a configuration component;

FIG. 4 depicts a flow chart;

FIG. 5 depicts a sequence diagram of a management mode;

FIG. 6 depicts a sequence diagram of managed and unmanaged modes;

FIG. 7 depicts a situation with a parked vehicle;

FIG. 8 depicts a schematic flow chart for a network assistance procedure; and

Fig. 9 and 10 each depict in a schematic flow chart the operation of the device on a side chain channel.

Detailed Description

Fig. 1 depicts a schematic flow chart for operating the control unit 100. Fig. 2a and 2b each depict a schematic structure of a device ue#1 comprising the control unit 100 of fig. 1. Hereinafter, reference is made to both fig. 1 and fig. 2.

The configuration means 102 configure a wake-up pattern for at least the Rx and/or TX transmitter TX, rx of the communication module CM of the wake-up device ue#1.

The deactivating means 110 deactivates the sleep mode of the device ue#1. If the associated contribution indicator CON indicates that the own location information POS is suitable for contributing to the determination of the location of at least one further device ue#2, the transmission means 114 transmit the location information POS via a side chain channel or another radio channel after the sleep mode deactivation. After transmission of the own position information POS, the activation means 104 activates the sleep mode.

In sleep mode, both the transmitter circuit and the receiver circuit are in sleep mode. The sleep mode includes deactivating certain functions. Deactivating the sleep mode includes activating at least one of the Rx circuit and the Tx circuit to operate. Activating the sleep mode includes deactivating at least one of the Rx circuit and the Tx circuit.

According to an example, the transmitted location information characterizes an at least temporarily stationary spatial location of the device ue#1. Therefore, the transmitted position information is referred to as self position information.

According to another example, the transmitted location information characterizes at least one assistance location information, which assistance location information originates from, for example, received satellite signals. Thus, the transmitted location information is referred to as assistance location information.

According to a further example, the transmitted location information characterizes an at least temporarily stationary spatial location of a device other than device ue#1. Thus, the transmitted location information is referred to as remote location information.

In section 120 it is checked whether at least one of the circuits Tx and Rx is to be woken up. The monitoring or processing means 106 monitors the trigger to wake up at least one of the circuits Rx and Tx. The determining or processing means 108 determines whether the wake-up trigger is active. If affirmative, the determining or processing means 110 is activated. In another case, the control unit 100 maintains the circuits Tx and Rx in the sleep mode.

The determining or processing means 112 determine whether the contribution indicator CON has to be updated, for example due to lack of precision. If the contribution indicator CON indicates that the location information POS is not suitable for contributing to the determination of the location of at least one other device ue#2, the updating means 116 updates the location information POS and the associated contribution indicator CON after the sleep mode deactivation.

The location information POS and the received location information comprise at least one of: absolute position, relative distance. In particular, the spatial location information may be conveyed via a cooperative lane merge CLM or via a cooperative awareness message CPM.

The updating 116 of the location information POS and associated contribution indicators CON is based on at least one or more of the following: at least one remote location information pos#2 characterizing the spatial location of another device ue#2 and having been received; at least one satellite information characterizing at least a signal propagation delay between the satellite and the device ue#1 and having been received; and at least one distance information characterizing a relative distance between the device ue#1 and another device ue#2.

The location information POS and the associated contribution indicator CON are stored on the memory unit M. The control unit 100 is activated upon receiving an activation signal ACT from the further control unit. The activation signal ACT is generated, for example, when the vehicle is parked, and the device ue#1 is a part of the vehicle.

The communication module CM comprises a circuit Rx for signal reception and reception processing and a circuit Tx for data processing and signal transmission. The communication module CM is communicatively coupled to at least one antenna a for transmission of radio signals.

If the device ue#1 is a part of a parked vehicle, location/position information of the parked vehicle is calculated and updated. The parked vehicle will detect its parking position x, y, z coordinates as position information POS either continuously or at selected time instances (e.g. periodically) and if possible it will augment it over time. Parked vehicles frequently wake up and communicate their location information to the mobile vehicle. Further examples include a process of reprocessing positioning measurements and/or calculations.

The device ue#1 parking the vehicle enters a power saving mode, a sleep mode, while parking allows the described procedure to wake up/activate the UE to perform at least one of the following:

a) The wake-up is received directly before the cooperative localization message CLM/cooperative awareness message CPM, which may be done by side chain excitation wake-up signal WUS before or at the beginning of CLM/CPM transmission;

B) Wake up to transmit CLM, in which case the UE follows a strict wake up timer procedure, e.g. discontinuous reception DRX, where UE #1 wakes up and makes its transmissions to perform channel access and send side-chain and Uu transmissions, where messages including self location information are transmitted during the active phase;

C) Wake up to adaptively calculate its exact location: in this case, ue#1 is requested to wake up to update its place or correct its place. According to an example, the internal timer is activated during an activation phase to perform SL location calculations or GNSS location updates or Uu location information acquisitions. Another alternative would be to have a roadside unit that sends a wake-up signal to all or some or one parked UE to wake-up and update the location. Thus, the wake-up device ue#1 may be controlled internally or externally.

During the wake-up time, either when WUS is received, or when WUS is expected, a decision is made by the UE based on a threshold whether to wake up or to continue sleeping. The threshold identifies how often the UE wakes up (e.g., the UE may not skip more than N wakeups, or the UE may not continue to sleep more than a maximum timer tmax), and how accurate the internally calculated precise positioning is.

After UE #1 wakes up or the UE is stimulated by WUS (i.e., by itself or by an external entity), one or more of the following processes are performed. For example, according to method (1), the vehicle does have accurate location information, or the accuracy is below a certain value, or the UE sleeps beyond tmax for N wakeups skipped; thus, the vehicle should wake up and perform one or more of the following: activating its receiver/transmitter and transmitting/receiving side chains; satellites detected via, for example, side chains and V2X messaging. UE #1 receives other CLM/CPMs transmitted by other active vehicles if there is positioning information of other vehicles. The vehicle then augments its location information based on the received CLM information.

According to method (2), the vehicle has its parking location, which is identified prior to sleeping. The location has a certain confidence threshold, e.g. an accuracy of 0.5m, and only aids others. Thus, the UE may not need to update/recalculate its location. Thus, the UE only wakes up: the position information added to the V2X signal is sent, which may allow for side chain positioning, for example. The receiving vehicle calculates a range from the communication signal and calculates a position from the received coordinates.

According to method (3), the vehicle starts with method (1) until it reaches a certain convergence; thus, after it reaches a certain confidence level (i.e. a threshold, e.g. an accuracy of 0.5 m), it switches to method (2).

In the side-chain based positioning mode, the device ue#1 determines location information based on provided positioning assistance originating from the RSU via a Uu link from the gNB/LCS. Alternatively or additionally, such S-PRS configuration may be determined by an RSU regardless of a connection to a network. Each RSU transmits the S-PRS along with its absolute location information through a side chain and the vehicle performs a measurement procedure according to the received S-PRS. The vehicle/apparatus ue#1 calculates its position by using the measurement and absolute position of the RSU.

According to another example, positioning assistance data for positioning settings/operations may be provided from the gNB/LCS to the vehicle/VRU or may be determined by the vehicle/VRU participating in the positioning procedure. In view of RTT-based positioning, the own vehicle transmits a request S-PRS and receives a response S-PRS (as a response) from the neighboring vehicle/VRU. Furthermore, during the S-PRS exchange, the own vehicle obtains measurements of the relative distance and AoA that are essentially required for relative positioning. The own vehicle calculates the relative position with the neighboring vehicles/VRUs.

There are several options to wake up the different components of ue#1:

According to the example depicted in fig. 2a, the radio part in the form of the communication module CM and its wake-up procedure generates a wake-up signaling wus#a, which is triggered externally by another TX or configuration (e.g. including discontinuous reception) such that the higher layer functions HFUN wake-up for positioning enhancements. Once the lower layers in the form of the communication module CM or parts thereof are awake, they can perform SL positioning and send ranges/angles to the upper layers in the form of higher layer functions HFUN. In addition, the lower layers may receive containers of other higher layer mechanisms (like CLM/CPM) and forward them to higher layers in the form of higher layer functions HFUN. In this case, the lower layer wakes up the higher layer after being active and responsible. The lower layer may request the higher layer to sleep again via the sleep signal ss#a when there is a timer or a signal from the scheduler sch#1, which is served by a clock CLK, e.g. GNNS (global navigation satellite system) clock, or when a further request is received from another radio terminal or radio access node. In other words, the deactivation of the sleep mode and the activation of the sleep mode of the higher layer function HFUN are controlled by the communication module CM.

According to another example depicted in fig. 2b, waking up the higher layer function HFUN is done via the scheduler sch#2 served by the internal accurate computer clock CLK. In this case, the lower layer does not control the higher layer to wake up and sleep, but instead, the higher layer drives the lower layer connectivity module to sleep or become awake again. Once the higher layer function HFUN wakes up the lower layer via the wake-up signal wus#b, the lower layer in the form of the communication module CM is activated and observes the radio environment as it does by other receivers. For example, the internal clock CLK may be based on satellite seconds or positioning GPS/GNSS seconds, causing the scheduler sch#2 to schedule higher layer functions HFUN to wake up for positioning augmentation. In the presence of a signal from scheduler sch#2, higher layer function HFUN requests communication to sleep again via sleep signal ss#b. In other words, the deactivation of the sleep mode and the activation of the sleep mode of the communication module CM are controlled by the higher layer functions HFUN.

Fig. 3 depicts a number of examples of configuration members 102. Receiving means 302 receives or determining means 304 determines or reads 306 from memory: a wake-up pattern characterizing at least a plurality of moments in time at which at least the receiver circuit Rx is woken up. If the wake pattern indicates the end of the sleep mode, the sleep mode is deactivated 110.

For example, the internal clock is energized at sleep/active cycles, e.g., periodically or quasi-periodically, or aperiodically (i.e., completely randomly) or following a pattern-based wake-up cycle. According to an example, the wake-up pattern is determined 304 pseudo-randomly, or is pre-configured in the vehicle UE, or is configured by the network for parking the vehicle, e.g. the configuration may be sent via receiving 302 the configuration C shortly before parking or during entering the sleep GTS signal.

According to an example, the wake pattern is specific to a vehicle associated with a particular parking zone or is tuned to a resource pool configuration, wherein the zone and/or its resource pool may be a zone and/or resource pool configured for a side-chain.

According to an example, a specific parking zone and/or associated pool of parking resources is configured via a parking lot private network, i.e. via Uu or side chains in the parking zone. In other words, the wake pattern (e.g., DRX pattern) is specific to such a zone configuration and/or an associated resource pool configuration for the zone/service. In this case, if the UE exists in multiple/overlapping areas or belongs to one area but has two or more wake-up services, for example, park level 1 and park level 2, the UE should follow wake-up patterns of the two areas or services. In this case, the UE is requested to tune to the associated resource pool.

Fig. 4 depicts a number of examples and schematic sequence diagrams of configuration members 102. The receiving means 402 receives or the determining means 404 determines or the reading means 406 reads: a wake-up opportunity pattern is characterized for at least a plurality of time periods during which at least the receiver circuit Rx is awake. The determining or processing means 410 determines whether one of the time periods is active. If affirmative, the radio channel for receipt of the wake-up signals wus#1, wus#2 is monitored 412 during at least one time period. If the wake-up signals wus#1, wus#2 are received during at least one period of time, the sleep mode of the Tx circuit is deactivated 110. If no wake-up signal is received during at least one time period, an active 104 sleep mode is performed.

The determining or processing means 414 determines whether a valid wake-up signal WUS has been received. If affirmative, a wake-up process is initiated via deactivating the sleep mode component 110.

The wake-up signals wus#1, 2 represent external requests, which are sent via a side-chain channel. For example, a moving vehicle or roadside unit transmits a side chain/V2V communication signal including wus#1, 2, i.e., through a side chain waveform. In this case WUS #1, 2 should be configured and expected by the receivers parked in a certain field/area. For example, WUS #1, 2 may be periodic-checking WUS transmissions via only periodic DRX cycles, or quasi-periodic-checking WUS transmissions via only quasi-periodic DRX cycles. The latter quasi-aperiodic DRX cycle checking WUS may follow some pattern.

According to an example, the periodicity or pattern of transmission of WUS #1, 2, WUS pattern, is configured for parking vehicles in a zone, or tuning to an associated resource pool configuration for that zone or parking service, wherein the zone and/or resource pool may be a zone and/or resource pool configured for a side chain. Additionally, a particular parking zone and/or associated pool of parking resources may be configured via a parking lot private network, i.e., via Uu or side chains in the parking zone. In other words, WUS patterns are specific to such zone configurations and/or associated resource pool configurations for the zone/service. In this case, if the UE exists in multiple/overlapping zones or belongs to one zone having two wake WUS patterns, for example, park level 1 and park level 2, the UE should follow the wake patterns of the two zones.

According to an example, wus#1, 2 transmits via UuWUS/paging event: the base station may also transmit WUS signals over direct communication (e.g., uu/V2N) between the vehicle and the network.

Fig. 5 depicts a schematic sequence diagram for a management mode, wherein at least configuration C is transmitted to device ue#1. In this example, the roadside unit RSU #1 is transmitting configuration C and wake-up signals WUS #1, 2. However, other entities like gNodeB/ue#2 may also transmit configuration C/wake-up signals.

RSU #1 operates according to the following: the monitoring means 502 monitors the radio channel SLCH for radio conditions. The determining means 504 determines a wake-up configuration C for the remote devices ue#1, ue#2, wherein the wake-up configuration C is determined based on the monitored radio situation. The transmission means 506 transmits the wake-up configuration C. Wake-up configuration C includes at least one of: a transmission pattern TP indicating at least a plurality of times at which at least one remote device ue#1, ue#2 should transmit the location information POS; and a wake-up pattern WP characterizing at least a plurality of moments in time at which at least the transmitter circuit Tx of at least one remote device ue#1, ue#2 is woken up.

After receiving 302 configuration C during Rx activity phase 512, device ue#1 application 508 configures and goes 510 to sleep.

According to the period 520 of the associated wake-up pattern WP, the device ue#1 turns on 110 its receiver Rx and monitors the side-chain channel SLCH. Since no wake-up signal is received, its receiver Rx goes to 104 sleep.

During a period 530 initiated by the wake-up pattern, the Rx circuit is turned on. The receiving means 532 receives at least one wake-up signal wus#1 comprising a transmission request TxR. If the Tx circuit is sleeping, the Tx circuit is activated 534 during stage 536. The device ue#1 transmits the location information POS to the device ue#2. After transmission of the location information POS, the device ue#1 enters 104 a sleep mode. After receiving the location information POS, the device ue#2 updates 536 its location information pos#2.

During the further period 540, at least or only the Rx circuitry is active. The receiving means 542 receive at least one further wake-up signal wus#2 comprising an update request UR, wherein the updating 116 of the location information POS and the associated contribution indicator CON is performed upon receipt of the update request UR.

The update 116 may be based on the location information pos#2 received 544 from the device ue#2 or other devices. Of course, other options for updating 116 are available, see above.

According to an example, WUS #1, 2 has a dedicated signal structure to be identified/detected by a sleeping vehicle. The detection/identification may be performed by correlation/matching, e.g. a preamble or blind decoding of an initial part of WUS (e.g. a control part of the signal). The sleeping vehicle may be configured/preconfigured (e.g., saved offline) by the network to perform WUS detection/decoding/correlation/scanning with a particular periodicity or pattern. This pattern is similar to a DRX cycle. However, the UE wakes up only to detect wus#1, 2. The wake-up signals WUS #1, 2 may be utilized to convey an identifier, e.g., an ID, of an exact vehicle unicast class wake-up or multiple vehicle multicast class wake-ups. Additional control information communicated using WUS #1, 2 includes at least one of: a request for transmitting CLM, a request for receiving CLM, a request for transmitting side chain positioning reference symbol SPRS, a request for performing side chain positioning, a request for performing Uu positioning, a request for performing GNSS acquisition, and the like.

The deactivation 110 of the sleep mode is based on at least one of: a contribution indicator CON; and the number of skipped wake-up opportunities.

Fig. 6 depicts a schematic sequence diagram. The following may be done during the managed mode, wherein reception of at least a wake pattern from a central entity must be complied with. On the other hand, the following may be performed during a non-management mode, in which there is no sleep mode of the central entity management apparatus ue#1.

During period 602, at least circuit Rx is active. The monitoring means 604 monitors traffic on the radio channel SLCH. The determining means 606 determines a transmission pattern indicating at least a plurality of times for transmission of the own location information LOC based on the monitored traffic. The transmission 114 of the location information POS is based on a transmission pattern.

Regardless of whether or not the transmission pattern is determined, the device ue#1 determines 608 a wake-up pattern for waking up at least the Rx circuitry. At step 610, a sleep mode is activated.

For example, CLM-enabled stations determine a transmission pattern and jitter based on: listening for a specific time and estimating the number of stations transmitting and other stations included for each GPS second RSU. The RSU may play a special role and be excluded from this step.

For positioning improvement, stations whose position information is improved need to process data received from other stations for cooperative positioning. This is especially the case for mobile stations, but is also useful for parked cars where improved positioning is desired. Furthermore, the infrastructure may also benefit from the transmitted data, as it may calculate the location of the transmission station. The use case is a parking lot management system.

According to an example, a transmission pattern is determined based on the amount of received data of a transmission station, the accuracy of data of a connection station, and the like. Further, the transmission pattern is determined based on at least one of: battery status, access to power, radio traffic status overcrowded or idle radio resources, current positioning accuracy, transmission patterns of other UEs, station dynamic static stations have higher weights.

As an example, if the network consists of 15 connected CLM enabled stations, a single station receives 11 updates per GPS second due to packet loss, etc. In this traffic situation and due to the partner's corresponding positioning accuracy contribution, the station can determine that 6 updates per second will be sufficient. In view of its low battery status and poor quality of its own satellite measurements, e.g. due to shadowing by tall buildings in its immediate vicinity, the transmission algorithm will determine to transmit CLMs only every 6 CLM periods. The system may be designed such that it quickly converges to a stable solution in a steady state, since if e.g. other stations also decrease their transmission rate, e.g. now only 5 updates per second from the network, the station will increase its transmission frequency again. In addition to waking up for transmission purposes only, the station may also determine a wake-up pattern for reception in case its positioning accuracy is too low. It will then not transmit at least until its positioning solution is good enough, but only receive and enhance its positioning.

According to another example, the message generation dither ms, FAC layer is determined. The task of this dithering is to avoid simultaneous transmissions by large subgroups of connected stations. The more stations are connected, the greater the desired value of jitter is required. Examples: a network broadcasting 6 messages, for example 1ms air time per GPS second, requires at least 6ms of jitter. If randomly allocated, the jitter should be even greater to avoid packet collisions. Higher update rates will require greater jitter generation. Steps 2 and 3 are processed in parallel and on a continuous basis to continually update the transmission pattern to cope with the dynamic environment requirements.

According to a further example, the station check averages 6 station transmissions per GPS period. Nmin=5, so theoretically, enough data is transmitted. However, it notices that its positioning accuracy is higher than average, so it will decide to transmit, but due to the low battery state it will only do so in a periodic transmission pattern every 3GPS seconds. It further determines that it has to transmit in a 7ms window after the GPS second in question.

According to another example, wake-up at GPS seconds is defined by an earlier defined pattern. Other station messages are received to update the transmission pattern and dithering step 1. And simultaneously transmitting own messages within a previously defined time window. In other words, the station transmits within 7ms determined in example 2 after GPS seconds, where the station wakes up and listens for messages within approximately the same time window.

The sleep mode is deactivated 110 and according to an example, if the contribution indicator CON indicates that the location information POS is not suitable for contributing to the determination of the location of the at least one other device ue#2, the Rx circuitry is activated while the Tx circuitry remains asleep. Thus, at least the Rx circuitry is active for time period 622.

The monitoring means 624 monitors traffic properties on the radio channel SLCH, e.g. counts the number of radio terminals in the vicinity of the device ue#1 that are transmitting their location information pos#2. Updating 106 the contribution indicator CON based on the monitored traffic attributes, wherein updating 116 comprises: a precision indicator is determined that indicates the accuracy of the determined location information POS, wherein the contribution indicator CON is determined based on the precision indicator.

The determining or processing means 630 determines that the contribution indicator CON indicates that the location information is to be sent. Thus, the sleep mode ends 104 and at least the Tx circuit is activated during the period 632. The location information POS is then transmitted 114 and the device ue#1 activates 104 its sleep mode. The device ue#2 determines 634 its location information based on the received location information POS.

Fig. 7 depicts a situation with parked vehicles vp#1-3 (e.g., in a parking lot) and moving vehicle MV. The moving vehicle MV in the vicinity of the parked vehicle requests and/or receives and/or transmits CLMs. When the mobile vehicle MV is activated (e.g., wakes up), the mobile vehicle MV sends and receives messages to/from the parked vehicle. In addition to CLM, the active vehicle may additionally calculate the side chain position to/from other vehicles. In this case, the active vehicle may send or receive the sidelink positioning reference symbol SPRS from the other vehicle. In this case, the second vehicle does not have to request a positioning symbol, but rather receives and/or transmits a side chain message containing a side chain positioning reference symbol. Thus, at least when the second vehicle receives the sidechain message, it will also be able to make sidechain positioning measurements. The satellite SAT provides satellite signals received by the vehicles MV, PV #1-3 for updating their respective location information. Wherein the side chain positioning value is provided by means of physical measurements of the received side chain positioning request signal, such as for example time of flight (ToF) and/or angle of arrival/departure (AoS/AoD) and/or Phase and Amplitude Change (PAC).

Fig. 8 depicts a schematic flow chart for a network assistance procedure for communicating instructions to a UE regarding waking up, see fig. 5. The monitoring means 802 determines a radio situation from the observed measurements, UE reports, etc. The determining or processing means 804 determines a wake-up pattern, a transmission pattern and a transmission jitter pattern as part of the configuration for the radio terminal/device UE. The transmission means 806 transmits the configuration to the UE. According to an example, the determining or processing means 808 applies the received configuration.

Fig. 9 depicts in a schematic flow chart operation 910 of device ue#1 on a side-chain channel and operation 920 on a downlink/uplink channel. The activation means 930 activates sleep modes for the Rx and Tx circuits.

The activation component 922 activates an Rx circuit for receiving signals on the side chain channel. The monitoring means 924 monitors radio traffic on the side-chain channel. Depending on the determined radio traffic, the position accuracy is determined via a determining or processing means 926.

The activation means 932 activates an Rx circuit for receiving a signal on a downlink channel. Monitoring means 934 monitors radio traffic on the downlink channel. Depending on the determined radio traffic, a wake-up pattern is determined via the determining or processing means 936.

The determining or processing means 940 determines whether the accuracy of the determined location information is sufficient. If affirmative, then the determining or processing means 942 determines whether to transmit a CLM. If the wake-up signal is transmitted via the transmission means 944 in the affirmative, the CLM is transmitted via the transmission means 946, and then the activation means 948 activates the sleep mode for the Tx circuit.

If the accuracy of the location information is not sufficient, the location information is determined based on the collected location information via the determining or processing means 950.

Fig. 10 depicts a schematic flow chart for operating a radio terminal or device ue#1. The configuration component 1002 configures the device according to the received or determined configuration. The determination processing means 1004 determines whether the device is sleeping. If affirmative, the determining or processing means 1006 checks whether the point in time at which the Tx and/or Rx circuits are awake has arrived. If affirmative, the communication means 1008 transmits the position information. According to the determining means 1010, the own location is updated. The determining means 1012 determines whether the point in time when the sleep mode was initiated has arrived.

Claims

1. A method, comprising:

deactivating (110) a sleep mode of the device (ue#1);

Transmitting (114) the location information (POS) after the sleep mode deactivation if the associated contribution indicator (CON) indicates that the own location information (POS) is adapted to contribute to the determination of the location of the at least one other device (ue#2); and

After transmission of the location information (POS), a sleep mode is activated (104).

2. The method according to claim 1, comprising:

If the contribution indicator (CON) indicates that the location information (POS) is not suitable for contributing to the determination of the location of the at least one other device (ue#2), updating (116) the location information (POS) and associated contribution indicator (CON) after a sleep mode deactivation.

3. The method of the preceding claim, wherein the updating (116) of the location information (POS) and associated contribution indicator (CON) is based on at least one or more of:

at least one remote location information (pos#2) characterizing the spatial location of another device (ue#2) and having been received;

at least one satellite information characterizing at least the signal propagation delay between the satellite and the device (ue#1) and having been received; and

At least one distance information characterizing a relative distance between the device (ue#1) and another device (ue#2).

4. The method according to one of the preceding claims, comprising:

-receiving (302) or determining (304) or reading (306) a wake-up pattern characterizing at least a plurality of moments in time at which at least a receiver circuit (Rx) is woken up;

wherein if the wake pattern indicates the end of the sleep mode, the sleep mode is deactivated (110).

5. The method according to one of the preceding claims, comprising:

-receiving (402) or determining (404) or reading (406) a wake-up opportunity pattern characterizing at least a plurality of time periods during which at least the receiver circuit (Rx) is awake;

Monitoring (412) a radio channel for reception of wake-up signals (wus#1, wus#2) during at least one time period; and

Wherein if a wake-up signal (wus#1, wus#2) is received during the at least one time period, the sleep mode is deactivated (110), or

If no wake-up signal is received during the at least one time period, a sleep mode is activated (104).

6. The method according to one of the preceding claims, comprising:

Receiving the wake-up indication may include receiving a wake-up signal (wus#1, wus#2) during the at least one time period, or

If a wake-up indication is not received during the at least one time period, a sleep mode is activated (104), wherein the wake-up signal has a specific signaling and structure indicating that at least a specific receiver triggers to wake up its receiver and/or lower layer transmission capabilities.

7. The method of claim 5, comprising:

At least one wake-up signal (wus#1) comprising a transmission request (TxR) is received (532).

8. The method according to one of the preceding claims, comprising:

At least one wake-up signal (WUS # 1) is received, wherein the wake-up signal itself or a subsequent signal comprises a transmission request (TxR), wherein the transmission request comprises a side chain location request signaling, wherein a receiver uses the side chain location request signaling to measure a physical distance range between the receiver and a transmitter transmitting the side chain location request.

9. The method according to one of the preceding claims, comprising:

the receiver receiving the side chain positioning request is triggered to measure the range of distances and/or the position angle between the receiver device and the transmitter node transmitting the side chain positioning request during the wake-up time by means of physically measuring the time of flight (ToF) and/or the angle of arrival/departure (AoS/AoD) and/or the Phase and Amplitude Change (PAC) of the side chain positioning request signal.

10. The method according to one of the preceding claims, comprising:

Triggering a receiver receiving a side chain positioning request to transmit a response to the side chain positioning transmission request; wherein the response incorporates a side chain distance range and/or position angle between a requesting transmitter and the receiver, wherein the value is incorporated into a physical transmission waveform or lower layer message during a wake-up time.

11. The method according to one of the preceding claims, comprising:

the measured range and angle values are sent to the transmitter during its wake-up time by the receiver receiving the side chain positioning request to the receiver upper layer.

12. The method according to one of the preceding claims, comprising:

At least one further wake-up signal (wus#2) is received (542), after which the intended receiver receives an Update Request (UR), wherein the update request comprises a message requesting the receiver node to perform an update (116) of the location information (POS) and the associated contribution indicator (CON) upon receipt of the Update Request (UR).

13. The method of one of the preceding claims, wherein the deactivation (110) of the sleep mode is based on at least one of:

A contribution indicator (CON); and

Number of skipped wake-up opportunities.

14. The method according to one of the preceding claims, comprising:

monitoring (604) traffic on a radio channel (SLCH);

determining (606) a transmission pattern based on the monitored traffic, the transmission pattern indicating at least a plurality of time instants for transmission of self location information (LOC); and

Wherein the transmission (114) of the location information (POS) is based on the transmission pattern.

15. The method according to one of the preceding claims, wherein the sleep mode is deactivated (110) if the contribution indicator (CON) indicates that the location information (POS) is not suitable for contributing to the determination of the location of the at least one further device (ue#2).

16. The method according to one of the preceding claims, comprising:

Monitoring (624) traffic properties on a radio channel (SLCH);

Wherein the contribution indicator (CON) is updated (106) based on the monitored traffic attributes.

17. The method of one of the preceding claims, wherein updating (116) comprises:

Determining a precision indicator, the precision indicator indicating an accuracy of the determined location information (POS);

Wherein the contribution indicator (CON) is determined based on the precision indicator.

18. The method of one of the preceding claims, wherein the deactivation (110) of the sleep mode and the activation (104) of the sleep mode of the higher layer functions (HFUN) are controlled by a Communication Module (CM).

19. The method of one of claims 1 to 17, wherein the deactivation (110) of the sleep mode and the activation (104) of the sleep mode of the Communication Module (CM) are controlled by a higher layer function (HFUN).

20. An apparatus (UE), comprising:

deactivating means (110) for deactivating a sleep mode of the device (ue#1);

-transmission means (114) for transmitting the location information (POS) after the sleep mode deactivation if the associated contribution indicator (CON) indicates that the location information (POS) is adapted to contribute to a determination of the location of at least one other device (ue#2); and

An activating means (104) for activating the sleep mode after transmission of the location information (POS).

21. A method, comprising:

-monitoring (502) a radio situation of a radio channel (SLCH);

Determining (504) a wake-up configuration (C) for the remote device (ue#1, ue#2), wherein the wake-up configuration (C) is determined based on the monitored radio situation; and

The wake-up configuration (C) is transmitted (506).

22. The method of claim 21, comprising, wherein the wake-up configuration (C) comprises at least one of:

a Transmission Pattern (TP) indicating at least a plurality of moments in time at which at least one remote device (ue#1, ue#2) shall perform a transmission of location information (POS), and

A wake-up pattern (WP) characterizing at least a plurality of moments in time, at which at least a transmitter circuit (Tx) of at least one remote device (ue#1, ue#2) is woken up.

23. An apparatus (RSU # 1), comprising:

-monitoring means (502) for monitoring a radio situation of the radio channel (SLCH);

-determining means (504) for determining a wake-up configuration (C) of a remote device (ue#1, ue#2), wherein the wake-up configuration (C) is determined based on the monitored radio situation; and

-A transmission means (506) for transmitting the wake-up configuration (C).

24. Use of the method according to one of claims 1 to 19, 21 and 22 or of the device (ue#1, rsu#1) according to claim 20 or 23.