JP2019033547A - Communication in wireless system - Google Patents

Abstract

To provide a method and apparatus for controlling at least one device configured to receive a scheduled frequency resource of a scheduled system.SOLUTION: A secondary frequency resource is allocated to at least one device in an inactive mode in a manner independent of the scheduling of a scheduled system. A signal is transmitted on the secondary frequency resource for the at least one device in the inactive mode in order to control reception of scheduled frequency resources, and the device in the inactive mode receiving the signal on the secondary frequency resource can control the reception of the scheduled frequency resource based on the signal.SELECTED DRAWING: Figure 4

Description

  The present disclosure relates to communication in a wireless communication system, and more particularly to transmission in a wireless communication system configured for scheduled transmission.

  A communication system can be thought of as a facility that allows communication between two or more nodes, such as fixed or mobile communication devices, and access points, such as base stations, servers, machine type devices. Communication systems and compatible communication entities typically operate according to a given standard or specification that specifies what various entities associated with the system are allowed to do and how to achieve them. For example, standards, specifications and related protocols define how communications between communication devices and access points should be arranged, how various aspects of communication should be provided, and how equipment should be configured be able to.

  The signal may be carried on a wired or wireless carrier. Examples of wireless systems include terrestrial public mobile communication networks (PLMN), such as cellular networks, satellite-based communication systems, and different wireless local networks, such as wireless local area networks (WLANs). A wireless system may be divided into service areas called cells, and for this reason, wireless systems are often referred to as cellular systems. One base station can provide one or more cells, and there are various types of base stations and cells.

  The user can access the communication system using an appropriate communication device or terminal. Typically, communication devices are used to allow reception and transmission of communications such as voice and data. Communication devices are typically provided with appropriate signals for receiving and transmitting arrangements to enable communication with other persons skilled in the art. A communication device can access a carrier provided by a base station and transmit and / or receive communications on the carrier.

  Transmission towards the receiving device can be based on scheduling. In scheduled wireless systems, periodic paging techniques are often used to save energy at the recipient device. The recipient device only needs to be placed in an active state for a short period of time, while it can be inactive for the remaining time. Two commonly used mechanisms for this purpose are the idle mode and the sleep mode. During the active period, the receiving device checks for incoming paging messages from the network. This principle of being able to switch between active and inactive states allows the recipient device to save power while the network is still available in case of network traffic, for example when a phone call is received. To.

  Modern networks typically have two levels of “paging”. A “regular” paging procedure is when the recipient communication device is connected in idle mode rather than in active mode. In the lightweight paging mode, the communication device is in connected mode, while in the discontinuous reception mode, the communication device is periodically listening for scheduling.

  However, paging periodicity can present problems in several ways. For example, if incoming traffic is not periodic, periodic paging can lead to packet delays, especially if the period is too long. In general, the average packet delay for a moment of random incoming traffic corresponds to half the time between paging moments. If the device is in active mode but does not receive a paging message, in particular if the period is too short, energy may be wasted at the recipient communication device.

  It is pointed out that the problems described above are not limited to any particular communication environment and station equipment, but can occur in any suitable system.

  Embodiments of the present invention are directed to addressing one or more of the problems set forth above.

  According to one embodiment, in a method for controlling at least one device configured to receive scheduled frequency resources in a scheduled system, scheduling for at least one device in an inactive mode Allocating secondary frequency resources independently of the scheduling of the scheduled system, and for at least one device in an inactive mode to control the reception of the scheduled frequency resources, Transmitting a signal over the resource.

  According to one embodiment, in a method for controlling a device configured to receive scheduled frequency resources of a scheduled system, independent of the scheduling of the scheduled system when the device is inactive. Thus, a method is provided that includes receiving a signal on a secondary frequency resource and controlling reception of a scheduled frequency resource based on the signal.

  According to one embodiment, an apparatus for controlling in a scheduled system at least one device configured to receive a scheduled frequency resource includes at least one processor and computer program code. An apparatus comprising at least one memory, wherein at least one memory and computer program code, together with at least one processor, are independent of scheduled system scheduling for at least one device in an inactive mode. Allocation of secondary frequency resources in the form of, and transmission of signals on the secondary frequency resources to at least one device in an inactive mode to control reception of the scheduled frequency resources. And it is configured to cause come, apparatus is provided.

  According to one embodiment, receives scheduled frequency resources of a scheduled system and receives signals on the secondary frequency resources independently of the scheduled system scheduling when the device is inactive. An apparatus for a device configured to control reception of a scheduled frequency resource based on a signal is provided.

  According to a more specific embodiment, when the first receiver function is in an inactive mode, more than a second receiver function configured to receive secondary frequency resources based on the signal. A first receiver function that operates over a wide bandwidth or based on different radio access technologies is controlled.

  The scheduled frequency resource can include at least one resource unit, the resource unit includes a first frequency resource, and the secondary frequency resource is a second smaller than the first frequency resource in one resource unit. Frequency resources. A resource unit may include a physical resource block of an orthogonal frequency division multiplexing (OFDM) system.

  Information about secondary resources can be communicated. Said information can be transmitted in a system information message or via dedicated signaling. This information may include at least one of user equipment identification and paging information.

  The secondary frequency resource may include at least one subcarrier of an orthogonal frequency division multiplexing (OFDM) system. The secondary frequency resource may be included at least partially within the scheduled frequency resource. Secondary resources may include direct current subcarriers of the OFDM system.

  It is possible to mute the signal to be transmitted on the scheduled resource and replace the signal with a secondary signal.

  Based on information about the secondary resource, it may provide at least one of encoding and rate matching of data to be transmitted on the scheduled resource. The signal can be modulated by a binary sequence. The binary sequence can be one of a plurality of binary sequences. One or more of the plurality of binary sequences may be reserved as a means for communicating secondary frequency resource related information.

  The signal on the secondary frequency resource can include a signal to wake up a function for receiving the scheduled resource.

  A computer program including program code means adapted to perform the methods described herein may be provided as well. According to further embodiments, apparatus and / or computer program products are provided that can be implemented on computer-readable media to provide at least one of the above-described methods.

  A network node, such as a controller entity or base station, for controlling transmission within one area or otherwise controlling operation within an area, according to at least some of the embodiments Can be configured to operate. A communication system implementing the apparatus and principles of the present invention may be provided as well.

  It should be appreciated that any feature of any aspect can be combined with any other feature of any other aspect.

  The embodiments will now be described in more detail, by way of example only, with reference to the following examples and the accompanying drawings.

FIG. 2 shows a schematic diagram of a cellular system in which some embodiments may be implemented. FIG. 2 shows a schematic diagram of a control device according to some embodiments. Fig. 2 shows a schematic presentation of a possible communication device with two receivers. 3 is a flow diagram according to certain embodiments. An example of a resource unit is shown. 2 shows an example of a two-receiver device. FIG. 4 shows an illustrative block diagram for a receiver device. A comparison between DRX and event-based reception. Illustrates the difference between a scenario where only a signal scheduled for transmission is generated and a scenario where a scheduled signal and a secondary signal are combined for transmission. Illustrates the difference between a scenario where only a signal scheduled for transmission is generated and a scenario where a scheduled signal and a secondary signal are combined for transmission.

  In the following, several illustrative embodiments are described with reference to a wireless or mobile communication system serving a mobile communication device. Before describing the illustrative embodiments in detail, some general principles of a wireless communication system, its access system and mobile communication device will be described in order to assist in understanding the technology underlying the described examples. Briefly described.

  A non-limiting example of recent advances in communication system architecture is Universal Mobile Telecommunications System (UMTS) Long Term Evolution (LTE), which is being standardized by the 3rd Generation Partnership Project (3GPP) . LTE utilizes a mobile architecture known as Evolved Universal Terrestrial Radio Access Network (E-UTRAN). Base stations in such systems are known as evolved or augmented NodeBs (eNodeBs, eNBs) and include E-UTRAN features such as user plane radio link control / medium access control / physical layer protocol (RLC / MAC / PHY). ) And control plane radio resource control (RRC) protocol termination may be provided towards the communication device. Other examples of wireless access systems include those provided by base stations in systems based on technologies such as wireless local area networks (WLANs) and / or WiMax (World wide Interoperability for Microwave Access).

  The communication device or terminal 1 may be provided with radio access via a base station or a similar radio transmitter and / or receiver node providing a radio service area or cell. FIG. 1 shows four base stations 11, 13, 15, and 17, but these are shown for illustrative purposes only and can provide a greater or lesser number of base station sites. Is also pointed out. A base station site may provide one or more cells or sectors. One sector can provide one cell or one sub-area of one cell. Thus, it will be appreciated that the number, size and shape of the cells can vary greatly.

  Communication within the base station and thus within the cell is typically controlled by at least one suitable controller device to allow its operation and management of mobile communication devices in communication with the base station. The control device can be interconnected with other control entities. The controller typically can include a storage capacity and at least one data processor. Controllers and functions can be distributed among multiple control units. In some embodiments, each base station can include one controller. In an alternative embodiment, two or more base stations may share the control device. For example, in LTE, a given eNB typically controls multiple cells.

  Different types of possible cells include those known as macrocells, picocells and femtocells. For example, a transmission / reception point or base station may include a wide area network node such as a macro eNodeB (eNB) that may provide coverage or a similar radio service area for the entire cell, for example. Base stations may also be provided with small or local radio service area network nodes, eg Home eNBs (HeNB), pico eNodeBs (pico-eNB) or femto nodes. In some applications, for example, a radio remote head (RRH, shown at 15 in the example) connected to one eNB (shown at 11 in the example) is used.

  Base stations and associated controllers may communicate through each other via fixed circuit connections and / or air interfaces. The logical connection between the base station nodes can be provided by, for example, an X2 interface. In FIG. 1, this interface is indicated by the dashed line indicated at 20.

  FIG. 2 shows an example of a controller for one node, for example to be integrated with, coupled to and / or otherwise controlled with any of the base stations. The controller 30 may be configured to provide control over communications within the service area of the base station site. Controller 30 may be configured to provide control functions in conjunction with scheduled transmission allocation. The controller may also be configured for secondary resource allocation according to some embodiments described below. For this purpose, the control device comprises at least one memory 31, at least one data processing unit 32, 33 and an input / output interface 34. Via the interface, the controller may be coupled to at least one receiver and at least one transmitter of the base station. The controller may be configured to execute appropriate software code to provide control functions. It will be appreciated that similar components can be provided in a controller provided elsewhere in the system, such as in the entity 24 of FIG.

  The communication device 1 may include any suitable device capable of receiving at least data wireless communication. For example, the terminal can be a portable data processing device with a wireless receiver, data processing and user interface equipment. Non-limiting examples include mobile stations (MS) such as those known as mobile phones or “smartphones”, portable computers such as laptop computers equipped with wireless interface cards or other wireless interface equipment , Tablet computers, personal digital assistants (PDAs) equipped with wireless communication capabilities, or any combination thereof. Further examples include wearable wireless devices such as watches, smart watches, glasses, helmets, hats, clothes, earphones with wireless connectivity, jewelry, etc., universal with wireless capabilities, A serial bus (USB) stick, a modem data card, or any combination thereof is included. A user's communication device is often referred to as user equipment (UE).

  FIG. 3 is a schematic, partially sectional view of a possible communication device. More particularly, a mobile or other form of mobile communication device 1 is shown. A mobile communication device is equipped with wireless communication capabilities and suitable electronic controls to enable its operation in accordance with the principles described herein. In this way, the mobile device 1 uses at least one data processing entity 6, for example a central processing unit, for use in performing the tasks it is designed to perform with the aid of software and hardware. It is shown with / or a core processor, at least one memory 8 and other possible components, for example an additional processor 5 and a memory 9. Data processing, storage and other related control devices can be provided on the appropriate circuit board 7 and / or in the chipset. The data processing and memory functions provided by the mobile device controller are configured to trigger control and signaling operations according to some embodiments of the invention, as described in subsequent portions of the specification. ing. A user may control the operation of the mobile device using a suitable user interface such as a touch-sensitive display screen or pad 4 and / or keypad, actuator buttons, voice commands, combinations thereof, and the like. Typically, speakers and microphones are provided as well. In addition, the mobile communication device can include appropriate connectors (either wired or wireless) for connecting external accessories to it, such as hands-free equipment, and / or for connecting to other devices. .

  A mobile device may communicate wirelessly with other devices via appropriate equipment for receiving and transmitting signals. In some embodiments, at least two different types of receiver devices can be provided. Thus, FIG. 3 schematically shows two radio blocks 2 and 3 connected to the controller of the device. The radio block can include radio components and associated antenna arrangements. The antenna arrangement can be arranged inside or outside the mobile device and can be shared by the wireless devices 2 and 3. According to one embodiment, device 2 provides the primary transceiver for mobile device 1 and device 3 provides the secondary receiver.

  In view of the functionality of the primary and secondary receivers, it is pointed out that these functionalities can also be provided by a single receiver device. Thus, instead of the two physically separate receivers of FIG. 3, only one receiver device can be provided, which receiver device is adapted to receive scheduled transmissions and secondary transmissions. Arranged.

  A secondary channel may be provided for reception by the secondary channel receiver of the communication device. In the following, embodiments are described in the context of an event-based paging mechanism that can act as a self-supporting or in conjunction with periodic paging principles.

  According to a more specific embodiment, a pre-paging message relating to the actual paging message is transmitted to the secondary receiver function of the receiving device with the primary receiver function inactive, thereby Received. At this time, the secondary receiver function notifies the main transmitter / receiver function about the actual paging incoming message. Thus, the main receiver function can be activated in response to the pre-paging message and can receive the actual paging message.

  The flow diagram of FIG. 4 illustrates, for example, a transmission by a base station to a communication device within its service area to control at least one device configured to receive scheduled frequency resources of a scheduled system. Fig. 4 illustrates an example of the use of a secondary channel in a communication system that is scheduled according to a predetermined scheduling algorithm. In this method, at 40, secondary frequency resources are allocated to at least one device that is in an inactive mode, independent of the predetermined scheduling of the scheduled system. Thereafter, at 42, one signal is transmitted to at least one device in an inactive mode to control reception of the scheduled frequency resource on the secondary frequency resource.

  FIG. 4 further illustrates steps 44 and 46 performed within the inactive communication device. At 44, the device receives a signal on the secondary frequency resource in a manner independent of the scheduling of the scheduled system. Reception of the scheduled frequency resource may then be controlled at 46 based on the signal communicated on the secondary resource.

  According to one embodiment, this signal operates over a wider bandwidth than a second receiver function configured to receive secondary frequency resources when the first receiver function is in an inactive mode. It can be used to control the first receiver function. According to another embodiment, the signals are communicated based on different radio access technologies.

  The signal is received by the secondary channel receiver function of the device in a mode where the scheduled frequency resource receiver function is not active. The receiver function may be provided by a single physical receiver device or by a separate receiver.

  The scheduled frequency resource can include at least one resource unit, and the resource unit includes a first frequency resource. The secondary frequency resource includes a second frequency resource that is smaller than the first frequency resource in one resource unit. The size is predetermined and is typically the minimum number of frequency resources that can be scheduled for transmission within a given scheduled system. For example, the resource unit may be a physical resource block (PRB) of an orthogonal frequency division multiplexing (OFDM) system, and the second frequency resource may include a portion of the OFDM PRB.

  Information about the secondary resource may be provided to at least one device that is in an inactive mode. Such information may be transmitted, for example, in a system information (SI) message. According to one possibility, this configuration is communicated to the device through dedicated signaling, eg using radio resource control (RRC) signaling.

  According to one embodiment, reception of a signal by the secondary resource receiver function at 44 triggers transmission of an internal interrupt signal to the main receiver function. In response to an internal signal that is more triggered by the reception of a signal on the secondary resource, the reception of the scheduled resource is activated, and thus incoming data can be received. This data may include periodic paging messages or any other data.

  In connected mode, the communication device knows the timing of the system. However, if the communication device is in an inactive mode and is scanning only possible secondary signals such as a wake-up signal, the device may not know the system timing.

  According to one embodiment, the first or main receiver operates with a wider bandwidth than the secondary receiver, making the first receiver more complex. The use of wide bandwidth requires higher sampling rates as well as more accurate and more power consuming clocks, for example. The use of wide bandwidth may also increase the power consumption of other RF components as well. Thus, according to one embodiment, a narrowband signal is introduced into a scheduled wireless system for detection and use by a low power secondary receiver. The use of narrowband signals may be advantageous because it requires low power components that can be used with a low sample rate in the secondary receiver.

  Narrowband transmission can be achieved using an in-band transmission scheme that does not require an additional transmitter.

  One possible scenario is Orthogonal Frequency Division Multiplexing (OFDM) based air (eg, used in LTE and LTE-A, and also likely to be available for future systems using OFDM for access). Disclose a method for implementing secondary resources in a subset of OFDM resources that is related to the interface. An OFDM channel can be divided into a number of physical resource blocks (PRBs). Each PRB is composed of a certain number of subcarriers that span a certain duration. For example, in LTE, the PRB spans 12 subcarriers and stores 14 OFDM symbols within a 1 ms transmission time interval (for normal cyclic prefix operation). Usually, the subcarriers of an OFDM system are grouped to include a set of resources that can be allocated to users during a certain period of time. The PRB includes a predetermined number of subcarriers (eg, 12, which means a total bandwidth of 180 kHz) during one transmission time interval (TTI). An example of a PRB 50 with 12 subcarriers 51 is illustrated in FIG. It should be appreciated that this is only an example, and for example, for the fifth generation (5G) concept, a larger PRB of approximately 10 MHz has been proposed.

  If the concept of a secondary receiver adapted to receive an unscheduled signal according to the scheduling of the scheduled radio system is adapted to the scheduled radio system, the secondary channel signal is It can be allocated within the bandwidth of the transmission site along with the data and control channels. If the entire PRB is allocated to one secondary signal, such as a wake-up or other interrupt signal, this can affect system capabilities and / or hardware complexity. Therefore, only a small subset of subcarriers are used and dedicated to the secondary channel. The number of subcarriers within one system bandwidth is usually large, so the addition of these subsets will result in a small throughput, especially if only a limited portion of the subset is dedicated to such secondary channels. Expected to only lead to a decline. However, according to the existing LTE standard, the smallest resource that can be allocated is PRB (ie, 12 subcarriers). Therefore, it may be necessary to change the standard regarding this point.

  Instead of using the same access technology and in-band secondary signals, another radio access technology (RAT) can be used to provide out-of-band secondary signals. Thus, for example, a wake-up signal is transmitted using another RAT that can be based on a standard tuned for low power consumption to control the receiver function of the scheduled resource of the scheduled system. Can be received. According to one scenario, a scheduled cellular system is complemented by a non-cellular system to provide secondary signals. Examples of RATs for communicating secondary signals include various short-range wireless systems, wireless local area networks (WLANs), and remote control systems. Specific commercially available examples of such systems include Bluetooth®, Wi-Fi®, ZigBee® and Z-Wave®. In the embodiment of FIG. 1, the signal may be transmitted to the mobile device 1 on secondary resources provided by the base station 17. Scheduled resources can be transmitted by the base station 11 of the cellular system.

  The operation of the first receiver and / or device can be controlled based on the signal received by the secondary receiver.

  An example of a receiver arrangement 60 that includes a first receiver or main receiver 62 and a secondary channel receiver 63 is shown in FIG. The secondary channel can be received, for example, by a tunable narrowband filter or by mixing to an intermediate frequency to which a fixed narrowband filter can be applied. Secondary channel transmitters may rely on the use of on-off keying, which basically modulates the signal by on-off tuning the carrier according to a predetermined binary sequence (eg, a gold sequence) with excellent cross-correlation characteristics. By detecting the carrier state using an envelope detector, a bit pattern can be received and correlated with a receiver specific sequence (ID). By using multiple parallel correlators, each applying a 1 bit shifted sequence, there is no need for power consuming radio frequency (RF) local oscillation (LO), so synchronization to bit sequences The need can be avoided.

  FIG. 7 shows an example of such an implementation. Robustness to interference can be achieved by exploiting the autocorrelation and cross-correlation properties of the selected binary sequence.

According to an exemplary embodiment, one subcarrier according to 3GPP LTE standard release 8 is used. Such subcarriers span 15 kHz in the frequency domain and 14 symbols in the time domain. Including overhead, this covers 1 ms. If the sequence is realized using one LTE symbol per bit, a clock frequency input to the correlator equal to the symbol frequency (15 kHz) is required. Thus, lower power consumption brought still should sequence with signaling state conceivable 2 ^∧ 14 is guided. Some states can be reserved for “encoding robustness”, while the rest can be used to provide some unique identity information (IDs). Another example is to use the same frequency resource within successive TTIs. Thereby, more symbols can improve the robustness or the number of IDs.

  The base station can inform the communication device about the identity (ID) assigned to it, and the receiver communication device can then switch off its primary receiver and enable the secondary receiver. . Further, the device and base station may need to agree on subcarriers to be used for signals to be received by the secondary receiver. This can be provided by using periodic control signaling / configuration mechanisms.

  A more specific example of the use of secondary resources in a scheduled system will now be shown in the context of the wake-up receiver (WuRx) concept and FIGS. In this concept, a master node or access point (AP) can wake up a specific node whenever needed to provide event-based reception triggering. A secondary low power receiver 63 (wake up receiver) is available that can detect a specific wake up signal transmitted by the master node. The internal signal 64 from the secondary receiver 63 to the main receiver 62 can include an internal signal to wake up the main receiver. In response to the interrupt signal 64, the main transceiver 62 then turns on the power so that it can receive data. While the wake-up receiver 63 is scanning the paging signal, the main transmitter / receiver 62 can be completely powered off, thereby achieving low power consumption.

  FIG. 8 illustrates a comparison between short / long periodic discontinuous reception (DRX) and event-based reception and, more particularly, event-based wake-up signal reception.

  Reuse of all PRBs has a high probability of degrading cell capacity because of the overall PRB allocation for wake-up signals or other secondary signals to be transmitted. Similarly, the complexity and power consumption of secondary receivers such as wake-up receiver (WuRx) hardware (HW) can increase significantly with increasing bandwidth.

  The wake-up signal is an independent additional signal that is added to the top of the existing signal structure. According to one possible implementation, a subset of the existing signal is muted to provide room for a new signal. Muting can be arranged so that all receiving devices know about it. It is possible that only inactive devices know the muting.

  If all potential recipient devices are informed of muting, one in-band carrier can be reserved in advance for this purpose. For example, both user equipment (UE) and eNB may be informed that some resources are lacking. At this time, the eNB and the UE have the capacity due to the above resource reservation for this wake-up channel, or for multiple wake-up channels if multiple UEs use different wake-up channels. Their rate matching can be tuned to take into account gaps. In this way, the loss of data bits that would be replaced by the wake up channel is avoided. This option can cause increased signaling because all UEs connected to the system need to know the location of the wake-up channel (s). According to one possibility, the position of the wake-up signal is included in the system information (SI).

  If only the inactive device knows the muting, there may be some missing resources at the physical level, so the eNB or other access system controller can decode by the receiving device It may be necessary to use less aggressive link adaptation to compensate for the relatively low performance in

  Secondary resources can include unscheduled resources. A secondary signal may be defined as an unscheduled resource because the transmitter scheduler does not deal with the secondary signal at all. Unscheduled resources may be included at least partially within the scheduled resources. For example, a physical resource block is already allocated to at least one connected device, i.e. the resource is scheduled for transmission, and the same physical resource and more particularly a subcarrier of the physical resource block is inactive Allocated to transmit wake-up signals to state devices.

  FIGS. 9 and 10 show a limited number within the main transceiver in the presence of a wake-up signal (FIG. 10) and in other cases where the entire wideband signal is used for periodic data (FIG. 9). This is a logical representation of how the subcarriers of can be muted. In this logical representation, the transmitter is shown as consisting of two separate logical transmitters, but in the physical implementation, the two transmitter functions are single as shown by the dashed lines. It is recognized that it can be constructed in the form of a physical transmitter.

  The main transmitter function has the functionality to distribute data and control channels in a standardized manner and mute specific subcarrier (s). The wake-up transmitter function generates a narrowband wake-up signal and informs the main transmitter when to mute the selected subcarrier (s).

  The wake-up signal can be transmitted in a time division multiplexed manner so that the wake-up signal is transmitted only within a dedicated carrier within a selected transmission time interval (TTI). That is, the wake-up signal can be transmitted only when needed, eg, in response to a particular event.

  The wake-up channel is realized, for example, by muting a predetermined sub-carrier, where the sub-carrier can only be modulated when the access point (AP) needs to send a wake-up signal. The advantage of this approach is that it can be easily implemented in the transmitter and can be low in terms of throughput reduction.

  A possible implementation is to use direct current (DC) subcarriers of the OFDM signal. If a secondary transceiver is used for the wake-up channel or the like, the DC subcarrier may be based on mixing with a slightly offset local oscillator (LO) frequency and then the signal Will continue to be added to the main antenna (s) before transmission. When the signal is received, the wake-up receiver mixes with the offset LO and can therefore demodulate the signal. This solution may require an additional transmitter, and the wake-up channel may be perceived as noise, so it may also require a better DC filter in the main receiver. On the other hand, the impact on throughput should be limited since DC subcarriers are generally not used for data transmission. According to one possibility, the wake-up receiver includes a tunable narrowband filter, thus avoiding the mixing procedure.

  According to one possibility, the secondary signal may be a periodic signal, for example a discontinuous reception (DRX) type signal intended to be received at the secondary receiver with different transmission periods.

  Although the embodiments are described in the context of LTE, the same principles can be used for any other communication system in which scheduled resources are allocated for transmission, or just for further development in LTE. It is possible to apply. Similarly, any other signal for an inactive device that can benefit from unscheduled communication on the secondary channel can be provided instead of the wake-up signal. Instead of the carrier provided by the base station, at least one of the carriers may be provided by the mobile communication device. For example, it does not provide any fixed equipment, but for example in a special network or other mobile station that acts as a base station or relay station and / or can communicate directly with each other using a plurality of mobile equipment May apply to the field of use provided. Thus, although some embodiments have been described above by way of example with reference to some illustrative architectures for wireless networks, technologies and standards, the embodiments are illustrated and described herein. The present invention can be applied to any suitable form of communication system other than those.

  The required data processing equipment and functions of the base station equipment, communication device and any other suitable equipment may be provided using one or more data processors. The functionality at each end described herein may be provided by a separate processor or an integrated processor. The data processor can be of any type suitable for the local technical environment, including, but not limited to, general purpose computers, special purpose computers, microprocessors, digital signal processors (DSPs), application specific integrated circuits (ASICs). ), One or more of a gate level circuit and a multi-core processor architecture. Data processing may be distributed across multiple data processing modules. For example, at least one chip can be used to provide the data processor. Appropriate storage capacity can also be provided in the associated device. The one or more memories may be of any type suitable for the local technical environment and may be any suitable data storage technology, such as semiconductor-based memory devices, magnetic memory devices and systems, optical memory It can be implemented using devices and systems, fixed memory and removable memory.

  In general, the various embodiments may be implemented in the form of hardware or application specific circuitry, software, logic or any combination thereof. Some aspects of the invention may be implemented in the form of hardware, while other aspects may be implemented in the form of firmware or software that may be executed by a controller, microprocessor, or other computing device. It is not limited to these. Although various aspects of the invention may be illustrated and described as block diagrams, flowcharts, or using some other pictorial representation, these blocks, devices, systems, and techniques described herein may be described. And the method may be implemented in the form of hardware, software, firmware, application specific circuits or logic, general purpose hardware or controllers or computing devices, or some combination thereof, as non-limiting examples Can be fully understood. The software is stored on a physical medium such as a memory chip, or a memory block implemented within the processor, a magnetic medium such as a hard disk or floppy disk, and an optical medium such as a DVD and its data variant CD. Can be done.

  The foregoing description has provided a complete and informative description of exemplary embodiments of the invention using exemplary, non-limiting examples. However, various modifications and adaptations may become apparent to those skilled in the art when read in conjunction with the accompanying drawings and appended claims. However, such and similar modifications of the teachings of the invention still fall within the spirit and scope of the invention as defined in the appended claims. Indeed, there are additional embodiments that include combinations of one or more of any of the other embodiments discussed above.

Claims (25)

A method for controlling at least one device configured to receive scheduled frequency resources of a scheduled system comprising:
The method
Independent of scheduling of the scheduled system, allocating secondary frequency resources to at least one device in an inactive mode;
Transmitting a signal on the secondary frequency resource to the at least one device in an inactive mode to control reception of the scheduled frequency resource;
Including a method. A method for controlling a device configured to receive scheduled frequency resources of a scheduled system comprising:
Receiving a signal on a secondary frequency resource independent of the scheduling of the scheduled system when the device is inactive;
Controlling reception of the scheduled frequency resource based on the signal;
Including methods.   When the first receiver function is in an inactive mode, with a wider bandwidth or a second receiver compared to a second receiver function configured to receive the secondary frequency resource 3. The method according to claim 1 or 2, comprising controlling a first receiver function operating based on a radio access technology different from the function based on the signal. The scheduled frequency resource includes at least one resource unit;
The resource unit includes a first frequency resource;
The secondary frequency resource includes a second frequency resource that is smaller than the first frequency resource in one resource unit;
4. A method according to any one of claims 1 to 3.   The method of claim 4, wherein the resource unit is a physical resource block of an orthogonal frequency division multiplexing (OFDM) system.   6. A method according to any one of the preceding claims, comprising communicating information about the secondary resource.   The method according to claim 6, comprising transmitting the information in a system information message or via dedicated signaling.   The method according to claim 6 or 7, wherein the information includes at least one of user equipment identification and paging information.   The method according to any one of claims 1 to 8, wherein the secondary frequency resource comprises at least one subcarrier of an orthogonal frequency division multiplexing (OFDM) system.   10. A method according to any one of the preceding claims, wherein the secondary frequency resource is at least partially contained within a scheduled frequency resource. Muting a signal to be transmitted on the scheduled resource;
Replacing the signal with the secondary signal;
The method according to claim 1, comprising:   12. The method of claim 1, comprising encoding at least one of data to be transmitted on the scheduled resource and rate matching based on information about the secondary resource. The method of crab.   The method according to any one of claims 1 to 12, wherein the secondary resource comprises a direct current subcarrier of an OFDM system. The signal is modulated by a binary sequence;
The binary sequence is one of a plurality of binary sequences;
14. A method according to any one of claims 1 to 13.   The method of claim 14, wherein one or more of the plurality of binary sequences are reserved for communicating information about the secondary frequency resource.   16. A method according to any one of the preceding claims, wherein the signal on the secondary frequency resource comprises a signal for causing a function to receive the scheduled resource to wake up. An apparatus for controlling at least one device configured to receive scheduled frequency resources in a scheduled system comprising:
The apparatus includes at least one processor and at least one memory including computer program code;
The at least one memory and the computer program code use the at least one processor;
An allocation of secondary frequency resources to at least one device in an inactive mode, independent of scheduling of the scheduled system;
Transmission of signals to the at least one device in an inactive mode on the secondary frequency resource to control reception of the scheduled frequency resource;
The device is configured to let Receiving the scheduled frequency resources of the scheduled system;
Receiving a signal on a secondary frequency resource independent of the scheduling of the scheduled system when the device is inactive;
Controlling reception of the scheduled frequency resource based on the signal;
Equipment for devices that are configured to.   Based on the signal, with a wider bandwidth compared to a second receiver function configured to receive the secondary frequency resource when the first receiver function is in an inactive mode, or 10. The apparatus according to claim 7 or 9, configured to control a first receiver function that operates based on a radio access technology different from the second receiver function. The scheduled frequency resource includes at least one resource unit;
The resource unit includes a first frequency resource;
The secondary frequency resource includes a second frequency resource that is smaller than the first frequency resource in one resource unit;
20. Apparatus according to any one of claims 17 to 19. Configured to communicate information about the secondary resource;
The information preferably includes at least one of user equipment identification and paging information.
21. Apparatus according to any one of claims 17 to 20. The secondary frequency resource includes at least one subcarrier of an orthogonal frequency division multiplexing (OFDM) system, and / or
The secondary frequency resource is at least partially included in a scheduled frequency resource, and / or
The secondary frequency resource includes a direct current subcarrier of an OFDM system;
Device according to any one of claims 17 to 21.   23. The apparatus according to any one of claims 17 to 22, wherein the signal on the secondary frequency resource comprises a signal for wake up a function for receiving scheduled resources. A network comprising a device according to claim 17 or any claim dependent on claim 17, or
A communication device comprising an apparatus according to claim 18 or any claim dependent on claim 18.   A computer program comprising code means adapted to perform the steps of any one of claims 1 to 16 when executed on a processor device.

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