Radio coexistence in wireless networks
Abstract
The invention relates to a device and computer-readable medium with stored instructions which, when executed, are designed to reduce coexistence interference between radio transceivers within the device. The device includes circuitry configured to identify a subframe that is substantially free of IDC interference from one or more of the device's radio transceivers. Said circuitry is further configured to determine that said subframe, which is substantially free of IDC interference, occurs during a non-scheduled period of a discontinuous reception cycle, DRX, for the device. The circuits are configured to perform radio link monitoring, RLM, during said subframe, which is substantially free of IDC10 interference, during the non-scheduled period of the device's DRX cycle.

Term
No projected expiry on record.
- Priority
- Filed
- Granted
- Today
14 claims: 11 independent, 3 dependent
- 1PATENTKRAV 1. Anordning inrättad att reducera samexistensinterferens mellan radiosändtagare inom anordningen, IDC-interferens [in-device coexistence interference], vilken anordning innefattar kretsar konfigurerade att:identifiera en delram som väsentligen är fri från IDC-interferens från en eller flera av anordningens radiosändtagare;fastställa att nämnda delram, som väsentligen är fri från IDC-interferens, uppträder under en icke-schedulerad period av en cykel för diskontinuerlig mottagning, DRX, för anordningen och utföra radiolänksövervakning, RLM, under nämnda delram, som väsentligen är fri från IDCinterferens, under den icke-schedulerade perioden av anordningens DRX cykel, varvid DRXcykeln är konfigurerad med en offsetperiod för cykelstart vald för att tillhandahålla minst ett reservationsmönster för HARQ. [hybrid automatic repeat request] process för att minska samexistensinterferensen mellan nämnda flertal sändtagare i TDD [time domain duplex] kommunikation.
- 2Anordning enligt krav 1, vidare inrättad att fastställa att nämnda delram, som väsentligen är fri från IDC-interferens, uppträder under åtminstone en av en schedulerad period eller en icke-schedulerad period av DRX-cykeln för anordningen.
- 3Anordning enligt något av kraven 1-2, varvid anordningens radiosändtagare innefattar minst två av en 3GPP LTE sändtagare, en WLAN sändtagare, en Bluetooth sändtagare och en GNSS mottagare.
- 4Anordning enligt något av föregående krav, vidare inrättad att utföra RLM mätningar under nämnda delram, som väsentligen är fri från IDC- interferens, under DRX-cykeln för anordningen för att väsentligen undvika radiolänksfel.
- 5Anordning enligt något av föregående krav, vidare inrättad att utföra RLM vid anordningen för att avbryta upplänkstransmission när nedlänkskvaliteten understiger ett förutbestämt tröskelvärde. 544 571
- 6Anordning enligt något av föregående krav, varvid anordningen är en användarenhet, UE.
- 7Anordning enligt något av kraven 1-5, varvid anordningen är en trådlös kommunikationsenhet.
- 8Anordning enligt krav 7, varvid DRX-cykeln är en lång DRX-cykel.
- 9Anordning enligt något av föregående krav, varvid anordningen innefattar en antenn, en pekskärm, en högtalare, en mikrofon, en grafikprocessor, en applikationsprocessor, ett internminne eller en port för ett icke-flyktigt minne.
- 10Datorläsbart medium med lagrade instruktioner, vilka vid exekvering är inrättade att påverka en anordning att:identifiera en delram som väsentligen är fri från IDC-interferens från en eller flera av anordningens radiosändtagare;fastställa att nämnda delram, som väsentligen är fri från IDC-interferens, uppträder under en icke-schedulerad period av en cykel för diskontinuerlig mottagning, DRX, för anordningen och utföra radiolänksövervakning, RLM, under nämnda delram, som väsentligen är fri från IDC- interferens, under den icke-schedulerade perioden av anordningens DRX-cykel, varvid DRX-cykeln är konfigurerad med en offsetperiod för cykelstart vald för att tillhandahålla minst ett reservationsmönster för HARQ. [hybrid automatic repeat request] process för att minska samexistensinterferensen mellan nämnda flertal sändtagare i TDD [time domain duplex] kommunikation.
- 11Datorläsbart medium med lagrade instruktioner enligt krav 10, vidare inrättat att vid exekvering påverka anordningen att utföra RLM mätningar under nämnda delram, som väsentligen är fri från IDC- interferens, under den schedulerade eller den icke-schedulerade perioden av DRX-cykeln för anordningen för att väsentligen undvika radiolänksfel i anordningen. 544 571
- 12Datorläsbart medium med lagrade instruktioner enligt något av kraven 10-11, varvid anordningens radiosändtagare innefattar minst två av en 3GPP LTE sändtagare, en WLAN sändtagare, en Bluetooth sändtagare och en GNSS mottagare. 5
- 13Datorläsbart medium med lagrade instruktioner enligt något av kraven 10-12, vidare inrättat att vid exekvering påverka anordningen att utföra RLM vid anordningen för att avbryta upplänkstransmission när nedlänkskvaliteten understiger ett förutbestämt tröskelvärde.
- 14Datorläsbart medium med lagrade instruktioner enligt något av kraven 10-13, inrättat för 10 exekvering i en anordning innefattande en antenn, en pekskärm, en högtalare, en mikrofon, en grafikprocessor, en applikationsprocessor, ett internminne eller en port för ett ickeflyktigt minne.
Independent claims14
135 paragraphs in 5 sections, as filed
Device for radio coexistence interference management
BACKGROUND
Modern wireless devices such as cell phones, tablet computers, and other portable computing devices incorporate various types of radio technology for communication purposes. A smart phone can, for example, include a 4G transceiver for connecting to a cell mast, a WiFi transceiver for connecting to a local activation point for the internet and a Bluetooth transceiver for connecting to a nearby device such as a headset or keyboard. The WiFi transceiver can receive information during essentially the same time period as the Bluetooth transceiver transmits information. In some examples, the 4G transceiver may transmit information at substantially the same time period as when the Bluetooth transceiver receives information. Consequently, coexistence interference may result between WiFi transceivers and Bluetooth transceivers or between 4G transceivers and Bluetooth receivers in the smart phone, thereby reducing the communication efficiency of each of the co-located transceivers.
Embodiments of the present invention relate to a user unit, UE, a wireless unit and computer-readable medium comprising stored instructions for the reduction of coexistence interference in a multi-radio unit in accordance with what appears from the independent patent claims 1 and 10.
Embodiments of the present invention relate to a user unit, UE, a wireless unit and and a method for reducing coexistence interference in a multi-radio unit, comprising receiving a configuration for discontinuous reception (DRX) at a multi-radio unit from an evolved NodeB [evolved NodeB] (eNodeB) , whereby the multi-radio unit is a user terminal with a plurality of radio transceivers; apply the DRX configuration to at least one of said plurality of radio transceivers in the multi-radio unit, wherein the DRX configuration comprises a long DRX cycle for at least one of said plurality of radio transceivers and selecting an offset period for cycle start from the group of 2 milliseconds (ms), 5 ms and 8 ms for the long DRX cycle to reduce coexistence interference between said plurality of radio transceivers in a multi-radio unit.
Embodiments of the invention provide that said plurality of radio transceivers comprise a Third Generation Partnership Project Long Term Evolution (3GPP LTE) radio transceiver and a Bluetooth radio transceiver.
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Embodiments of the invention provide that the offset period of 2 ms for cycle start provides at least one HARQ. reservation pattern to reduce coexistence interference between Bluetooth radio transceivers and an LTE radio transceiver communicating in LTE Time Division Duplex (LTE-TDD).
Embodiments of the invention provide that the offset period of 5 ms for cycle start provides at least one reservation pattern for HARQ. process to reduce coexistence interference between Bluetooth radio transceivers and an LTE radio transceiver communicating in LTE Time Division Duplex (LTE-TDD).
Embodiments of the invention provide that the offset period of 8 ms for cycle start provides at least one reservation pattern for HARQ. process to reduce coexistence interference between Bluetooth radio transceivers and an LTE radio transceiver communicating in LTE Time Division Duplex (LTE-TDD).
Embodiments of the invention provide a method further comprising monitoring, by means of the user terminal UE, of the Physical Downlink Control Channel (PDCCH) during the long DRX cycle.
Embodiments of the invention provide that selecting one of said plurality of offset periods for cycle start includes providing at least one reservation pattern for HARQ. process to ensure that each of said plurality of radio transceivers for the user terminal UE does not transmit information while another radio transceiver for the UE does not receive information, so that the coexistence interference between said plurality of transceivers in the user terminal UE is reduced, each radio transceiver incorporating different Radio Access Technology (RAT).
Embodiments of the invention provide a multi-radio wireless device comprising a discontinuous reception (DRX) module configured to apply DRX to a radio transceiver in a user terminal UE with a plurality of coexisting radio transceivers, one of which radio transceivers operates in accordance with the Third Generation Partnership Project Long Term Evolution Release 8, 9, 10 or 11 (3GPP LTE); a reference resource subframe selection module configured to select a downlink reference resource subframe substantially without intra-device interference from said plurality of coexisting radio transceivers in the UE; and a module for
544 571 channel state information (CSI) reporting configured to periodically report the CSI, from the UE to the eNB, at a CSI reporting subframe, wherein the CSI reporting subframe is located within a selected number of subframes from the reference resource downlink subframe.
Embodiments of the invention provide that said plurality of coexisting radio transceivers comprise at least two radio access technologies (RAT), the radio access technologies including: a 3GPP LTE radio transceiver, a Wireless Local Access Network (WLAN) transceiver, a Bluetooth transceiver and a Global Navigation Satellite System (GNSS) receiver.
Embodiments of the invention provide that the CSI reported to the eNB does not significantly reduce the capacity of the user terminal due to interference within the unit from said plurality of coexisting radio transceivers in the user terminal UE.
Embodiments of the invention provide that the CSI comprises at least one of a channel quality indicator [channel quality indicator] (CQ.I), a precoding matrix indicator [precoding matrix indicator] (PMI) and a rank indicator [rank indicator] (RI).
Embodiments of the invention provide that the module for CSI reporting is further configured to report the CSI, from the UE to the eNB, during a transition period from a non-scheduled period to a scheduled period, whereby the non-scheduled period and the the scheduled period occurs during a long DRX cycle for 3GPP LTE radio transceivers.
Embodiments of the invention provide that the reference resource downlink subframe includes a CSI reference resource.
Embodiments of the invention provide that the CSI reporting module is further configured to periodically report CSI in an uplink subframe to the eNB, whereby the uplink subframe occurs at least four subframes after receiving the downlink subframe for the reference resource from the eNB.
Embodiments of the invention provide that the CSI reporting module is further configured to receive the reference resource downlink subframe, in the UE from the eNB, during a time period that does not correspond to another coexisting radio transceiver in the UE transmitting a subframe for uplink.
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Embodiments of the invention provide that the CSI reporting module is further configured to receive the reference resource downlink subframe, in the UE from the eNB, during a scheduled period of the long DRX cycle.
Embodiments of the invention provide a wireless multi-radio unit, comprising a radio link monitoring (RLM) module configured to: determining a subframe, for a wireless WAN (WWAN) radio transceiver, substantially without intra-device interference during a non-scheduled period of a long DRX cycle and performing radio link monitoring (RLM) using the subframe substantially without intra-device interference during the non-scheduled period of the long cycle of discontinuous reception (DRX) from a plurality of coexisting radio transceivers in the wireless multi-radio unit.
Embodiments of the invention provide that the RLM module is further configured to perform RLM on the wireless multiradio unit's WWAN radio transceiver during a scheduled period of the long DRX cycle of the DRX.
Embodiments of the invention provide at least one computer-readable medium comprising stored instructions for reducing coexistence interference in a multi-radio unit, which instructions affect the machine to, when executed in the machine, apply discontinuous reception to a user terminal (UE) having a plurality of coexisting radio transceivers, the DRX comprising a long DRX cycle for the UE; selecting a cycle start offset period from a group of cycle start offset periods for the long DRX cycle to reduce coexistence interference between said plurality of coexisting radio transceivers in the UE and reporting channel state information (CSI), from the UE to the eNB, during the long DRX cycle for the UE and after receiving a reference resource downlink subframe from the eNB, wherein the reference resource downlink subframe is received from the eNB during a period outside the non-scheduled period of the long DRX cycle.
Embodiments of the invention provide that a location of the reference resource downlink subframe is selected as a subframe essentially without interference within the unit from said plurality of coexisting radio transceivers in the UE.
Embodiments of the invention provide that the cycle start offset periods for the long DRX cycle include one of 2 milliseconds (ms), 5 ms, and 8 ms.
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Embodiments of the invention provide that the cycle start offset periods are chosen to provide at least one reservation pattern for the Hybrid Automatic Repeat Request (HARO.) process to ensure that each of the UE's radio transceivers does not transmit/receive information while another of the UEs: ns radio transceiver receives/transmits information, thereby reducing coexistence interference between said radio transceivers in the UE, each of the radio transceivers having a different radio access technology (RAT).
BRIEF FIGURE DESCRIPTION
Features and advantages of the invention will be apparent from the detailed description that follows, together with associated drawings which together exemplarily illustrate the invention's features and in which:
Figure 1 illustrates an example timing diagram for Bluetooth packets synchronized with subframes in multiple Time Division Duplex (TDD) configurations for a Third Generation Partnership Project (3GPP) Long Term Evolution (LTE) transceiver, Figure 2 is a diagram exemplary illustrating a long cycle for discontinuous reception (DRX), Figure 3
a. illustrates an example of an exemplary TDD configuration that supports DRX patterns,
b. illustrates an example of an exemplary TDD configuration that supports DRX patterns,
c. is a timing diagram showing an LTE transmit/receive pattern and a Bluetooth transmit/receive pattern in accordance with an example, Figure 4 exemplarily illustrates an ASN code example for DRX configuration information, Figure 5 illustrates a channel state information (CSI) reference resource during a long
DRX cycle according to an example, Figure 6 shows a flowchart of a method for reducing coexistence interference in a multi-radio unit with an embodiment of the present invention, Figure 7 illustrates an example block diagram of a radio coexistence system, Figure 8 illustrates an example of a mobile wireless device.
544 571
Reference will now be made to the illustrated exemplary embodiments and specific terminology will be used to describe them. However, it should be understood that these do not entail any limitation of the scope of the invention.
DETAILED DESCRIPTION
Before the invention is presented and described, it should be understood that this invention is not limited to particular structures, process steps or materials shown herein but extends to equivalents thereof as would be apparent to one of ordinary skill in the art. It should also be understood that the terminology used herein is used to describe particular embodiments only and is not intended to limit the invention.
DEFINITIONS
As the terminology is used herein, the term refers to substantially the entire or substantially the entire extent or degree of an action, characteristic, property, condition, structure, item or result. For example, an object that is substantially enclosed means that the object is either fully enclosed or almost completely enclosed. The degree of permissible deviation from a total scope depends in some cases on the specific context. In general, however, proximity to total scope is to be understood as the same overall result being achieved as with total scope. The use of essentially is similarly applicable when used in a negative sense to refer to the total or almost total absence of an action, feature, characteristic, state, structure, item or result.
Other terms may be defined differently in the description itself.
EXEMPLARY EMBODIMENTS
An initial overview of embodiments is provided below and specific embodiments are explained in more detail later. The initial overview is intended to assist readers in a more rapid understanding of the technology, but is not intended to identify the main features or essential functions of the technology, nor is it intended to limit the applicable scope of protection.
Bluetooth transceivers are often co-located with other types of radio and/or transceivers, such as transceivers that communicate using Orthogonal Frequency Division Multiple Access (OFDMA), such as a Third Generation Partnership Project transceiver
544 571 (3GPP) Long Term Evolution (LTE), Institute of Electrical and Electronics Engineers (IEEE) 802.16 transceiver, commonly referred to as WiMAX (Worldwide interoperability for Microwave Access), wireless local area network (WLAN) transceiver (ie IEEE 802.11 radio, commonly called WiFi) and/or Global Navigation Satellite System (GNSS) receivers.
Each collocated radio can be used for a specific purpose. For example, Bluetooth transceivers can be used to communicate with a Wireless Personal Area Network (WPAN), a WiFi transceiver can be used to communicate with a Wireless Local Area Network (WLAN), and a 3GPP LTE or WiMAX transceiver can be used to communicate with a wireless WAN [Wide Area Network] (WWAN).
Simultaneous use in a wireless device (eg a smart phone or tablet) of a Bluetooth transceiver that is co-located with other transceivers that communicate using OFDMA, such as a 3GPP LTE transceiver, a WiMAX transceiver and/or a WiFi transceiver may give rise to interference that reduces the data capacity of both transceivers. In this description, several examples of a co-located Bluetooth transceiver and a 3GPP LTE transceiver are given, which examples are not intended to be limiting. The same system and method(s) can be applied to other types of OFDMA radio in a Time Domain Duplex (TDD) format and which are co-located with a Bluetooth transceiver.
In general terms, TDD refers to duplex communication links where the uplink is separated from the downlink by an allocation of different time slots in the same frequency band. Since TDD allows asymmetric flow for the uplink and downlink data transmission, users are allocated time slots for uplink and downlink transmission. TDD can be beneficial when uplink and downlink data rates are asymmetric.
Bluetooth receptions can collide with transmissions from 3GPP LTE transceivers, especially when both transceivers are co-located on the same device, such as a smartphone, tablet, laptop, or other type of wireless mobile device. Bluetooth transmissions can also result in more insensitive reception in a 3GPP LTE transceiver.
To further reduce coexistence interference, there are various types of potential solutions. One such solution is to use frequency division multiplexing (FDM) to frequency separate the signal from a transceiver further from
544 571 signal for another transceiver and thereby create greater frequency separation. Another potential solution is the use of time division multiplexing (TDM) whereby scheduling can be used so that when a transceiver transmits there is no simultaneous reception in a co-located transceiver.
An example of TDM may include discontinuous reception (DRX) which will be discussed in further detail below. A radio frequency solution involves the use of radio frequency filtering which can be used to reduce the amount of out-of-bounds (OOB) emission, using a filter at a transmitter or blocking incoming out-of-bounds signals by a filter at a receiver. Power-based solutions can be used to reduce transmission power, thereby potentially reducing the level of interference. Hybrid solutions are also possible by combining two or more of the previously presented solutions.
Repeating transmission/reception (Tx/Rx) patterns in the time domain can be defined for a 3GPP LTE transceiver and a co-located Bluetooth transceiver to coordinate their transmitter and receiver. The Tx/Rx pattern can be repeated at a known interval if the data is allocated with a periodicity in time. The known range makes it possible to make constant reservations in 3GPP LTE transceivers to reduce or avoid interference between different transceivers.
The repeated Tx/Rx pattern defines a specific Bluetooth transmission time slot for each Extended Synchronous Connection Oriented (eSCO) packet sent by Bluetooth transceivers to prevent Bluetooth transmission from interfering with 3GPP LTE reception and protect 3GPP LTE transmission from interfering with Bluetooth reception.
The ability to coordinate 3GPP LTE and Bluetooth transmitters and receivers using persistent reservation also enables co-location of additional transceivers. For example, a WiFi transceiver can be coordinated to communicate at specific time periods in the coordination created between 3GPP LTE and Bluetooth transceivers.
Figure 1 provides a timing diagram showing transmission and reception of eSCO formatted packets 102 for a Bluetooth radio and Tx/Rx subframes 104 for all seven configurations of a 3GPP LTE radio operating in a Time Division Duplex (TDD) mode. The ones in here
544 571 presented the figures and tables shown using Bluetooth eSCO packets with a time slot as an example. However, this interference avoidance technique can be applied to other Bluetooth profiles and packet lengths (eg packets with three or five timeslots). Bluetooth eSCO packets can include a number of different formats that have different numbers of time slots for transmission and reception. For single time slot eSCO packets, Bluetooth specifies intervals of 6, 8, 10, 12, 14, 16, and 18. The interval shown in Figure 1 is T<sub>e</sub>sco=8 comprising four time slots for transmission and four time slots for reception. Bluetooth also specifies a retransmission window W<sub>e</sub>sco to be 0, 2 or 4. The retransmission window specifies the number of retransmission attempts that can occur for Bluetooth packets within its range (T<sub>e</sub>sco). While the specification currently limits retransmission attempts to 0, 2 or 4 occasions, it is possible to include additional retransmission attempts when T<sub>e</sub>sco is equal to or greater than 8. Additional Bluetooth standards may include additional retransmission attempts and the embodiments discussed herein are not limited to the 0, 2, or 4 instances mentioned in the current standard.
The 3GPP LTE standard as it appears herein may include 3GPP LTE Release 8 from the fourth quarter of 2008, 3GPP LTE Advanced Release 10 in the first quarter of 2011, and Release 11 in the third quarter of 2012. However, the embodiments discussed herein are not limited to these releases. Future standards may be applicable when these relate to the same TDD configurations and subframe timing. A transceiver operating in accordance with one of its 3GPP LTE editions is referred to herein as an LTE transceiver. The use of designations 3GPP; 3GPP LTE and LTE is not intended to be restrictive. Each of these designations can refer to each of the 3GPP releases.
Seven different LTE TDD configurations are currently defined for 3GPP LTE communication. Figure 1 provides an example of each LTE configuration, numbered 0-6. Each configuration is aligned at the beginning 106 of the longer continuous number of received subframes for each configuration. The Bluetooth packet is synchronized so that a first receive time slot (Slot 1) is aligned with the first receive time slot for continuous receive subframes in each of the seven LTE configurations.
As illustrated in Figure 1, Bluetooth time slots 102 have a different time period than the LTE subframe. Bluetooth time slots each have a period of 0.625 milliseconds (ms) during which each LTE
544 571 frames have a frame duration of 10 ms. Each LTE frame comprises 10 subframes. Each subframe therefore has a duration of 1 ms. Even if the Bluetooth packet is synchronized so that transmit time slot Slot 0 is aligned with a transmit subframe in each LTE TDD configuration and receive time slot Slot 1 is aligned with the first receive subframe of the continuous receive subframe for each configuration, the transmit and receive time slots will quickly become out of phase so that transmissions and receptions from Bluetooth and 3GPP transceivers give rise to co-interference in each of the transceivers.
Co-interference can occur when one of the transceivers transmits during the reception interval of the other transceiver. This is especially true when the 3GPP LTE transceiver is transmitting during a Bluetooth transceiver reception period, since the 3GPP LTE transceiver transmits at significantly higher power and thereby dominates (or collides with) most Bluetooth signals that the Bluetooth transceiver is trying to receive during the Bluetooth reception period.
Figure 2 is a diagram illustrating a long cycle for discontinuous reception (DRX) in accordance with an example. The DRX concept is introduced in 3GPP LTE Release 8 with the aim of saving power. DRX can be used to enable a wireless entity, such as a user terminal (UE) in a 3GPP LTE network to discontinuously monitor a control channel, such as the Physical Downlink Control Channel (PDCCH) communicated from a transmitting station such as an evolved node (eNB or eNodeB). The discontinuous monitoring used by DRX can provide substantial power savings at the UE because the receiver at the UE can be turned off for selected periods. Scheduling of a 3GPP LTE transceiver using DRX will be explained in more detail below.
In accordance with an embodiment of the present invention, DRX, in addition to saving power, can also be used to provide a TDM solution for coexistence interference reduction for co-located devices. Coexistence interference between co-located 3GPP LTE transceivers and a low power Bluetooth (BT) transceiver can for example be reduced, using DRX, by scheduling the BT transceiver to transmit when the LTE transceiver is not receiving.
In one embodiment, a transceiver in a wireless multiradio unit (eg, an LTE transceiver) can be configured to turn off more frequently by reducing the amount of time during which the transceiver monitors control channels, such as the Physical Downlink Control Channel (PDCCH). In other words
544 571, the transceiver may communicate with a transmission station, referred to as a network node, to negotiate time periods during which the transceiver will receive communications from the network node. During the negotiated times when information is not received, the transceiver may turn off its receiver and enter a low power mode. DRX is used in a number of wireless communication standards, including but not limited to 3GPP LTE Release 8, 9, 10 and 11.
The 3GPP LTE transceiver can be configured to monitor the PDCCH discontinuously if the 3GPP LTE transceiver is configured for DRX and is in an RRC_CONNECTED mode. In other cases, a 3GPP LTE transceiver not configured for DRX may monitor the PDCCH continuously. The Radio Resource Control (RRC) can be used to control DRX management in a 3GPP LTE transceiver by configuring the parameters onDurationTimer, drx-lnactivityTimer, longDRX-Cycle, drxStartOffset and optionally drxShortCycleTimer and shortDRX-Cycle. When a short DRX cycle is not configured, the 3GPP LTE transceiver monitors the PDCCH at the start (according to the length defined in onDurationTimer) of the longDRX-Cycle parameter. The 3GPP LTE transceiver can stop monitoring the PDCCH after the onDuration-Timer if the downlink and/or uplink transmissions can be terminated. In the remaining DRX cycle (eg a short DR cycle), the 3GPP LTE transceiver may become inactive. During this time, the eNB does not schedule transmissions on the downlink and the eNB also does not request the transmission of data on the uplink from the 3GPP LTE transceiver. When the short DRX cycle is configured, the short DRX cycle can be perceived as a confirmation period of when a packet arrives late, before the 3GPP LTE transceiver enters the long DRX cycle. When data arrives at the eNB while the 3GPP LTE transceiver is in the short DRX cycle, the data is scheduled for transmission at the next wake-up time, after which the 3GPP LTE transceiver resumes continuous reception. On the other hand, if data does not arrive at the eNB during the short DRX cycle, the 3GPP LTE transceiver may enter the long DRX cycle if packet activity has ended for the moment. DRX Activity Time is the duration during which the 3GPP LTE transceiver monitors the PDCCH within the DRX cycle.
Returning to Figure 2, an example of a long DRX cycle is shown. The long DRX cycle may include an ON duration and an OFF duration. During the ON period of the long DRX cycle (ie a scheduled period), the eNB can schedule transmissions to the UE. During the OFF period of the long DRX cycle (ie a non-scheduled period), the eNB cannot schedule transmissions to the UE. The UE can i
544 571 generally transition to a long DRX cycle from any short DRX cycle after a timer expires.
Figures 3a and 3b illustrate exemplary TDD configurations 310 and 320 for supporting DRX patterns in accordance with an example. A limitation in using a DRX solution to reduce coexistence interference in a multi-radio unit is that the currently supported long DRX cycle values do not include several values that can be used to significantly improve coexistence scenarios within the unit. For example, long DRX cycle values that can be used to reduce intra-device interference in an LTE and Bluetooth scenario (eg an LTE transceiver transmitting/receiving information at substantially the same time as a Bluetooth transceiver transmitting/receiving information) are not allowed. These long DRX cycle values can include 2 milliseconds (ms), 5 ms, and/or 8ms. As will be discussed in more detail below, the DRX cycle values of 2 ms, 5 ms, and 8 ms can provide one or more useful reservation patterns for Hybrid Automatic Repeat Request (HARQ.) processing.
A limitation in using DRX to reduce coexistence interference in an LTE and Bluetooth scenario is that DRX supports contiguous LTE subframes on the downlink (DL) within a single DRX cycle when the LTE On Duration period is extended. Using the available DRX cycle values, when the DRX solution is used for LTE and Bluetooth scenarios, the DRX cycle is 10 ms. In addition, a 5 ms short DRX cycle can be used within a 10 ms long DRX cycle. The DRX can thereby support bitmap patterns with LTE ON subframes on the downlink that are contiguous in a 10ms period or a 5ms period.
Figure 3a illustrates an example of a DRX pattern with a cycle time that can be used to reduce interference within a multi-radio unit. Among other things, the advantages of including a 2 ms long DRX cycle for LTE and Bluetooth scenarios are shown. The exemplary configuration 310 is a TDD configuration 2. The configuration 310 includes m number of frames and has an offset of 2 ms for cycle start. The total length of the configuration 310 is 10 ms long and each subframe is 1 ms long. In addition, the configuration 310 can be represented by the bitmap 0111010111. In other words, 0 means that a subframe cannot be used (ie, the subframe can be turned off) and 1 means that the subframe can be used. Subframes that are turned off are 0, 4 and 6 which thus results in the bitmap 0111010111. The subframes in configuration 310 can either be downlink (DL) or uplink (UL) subframes. In the figure, the downlink subframes are shaded and
544 571 the uplink subframes are not filled. According to TDD Config 2 (which is one of seven TDD configurations available), subframes 0,1, 3, 4, 5, 6, 8, and 9 can be downlink DL subframes and subframes 2 and 7 be subframes for uplink. In addition, for DRX patterns pertaining to the LTE and Bluetooth scenario, the uplink subframes are usually not considered. Consequently, subframes 0, 4, and 6 are OFF and subframes 2 and 7 are for uplink, resulting in subframes 1, 3, 5, 8, and 9. In other words, subframes 1, 3, 5, 8, and 9 are LTE ON subframes and displayed as patterned subframes.
Accordingly, a 2 ms long DRX cycle value may be beneficial with configuration 310 to support more HARQ bitmap patterns. The first subframe is included in the first 2 ms cycle, the third subframe is included in the second 2 ms cycle, the fifth subframe is included in the third 2 ms cycle, and both the eighth and ninth subframes are included in the fifth 2 ms cycle. Neither subframe 6 nor 7 is included in the fourth 2 ms cycle because subframe 6 is OFF and subframe 7 is an uplink subframe. Subframe 8 is perceived as onDuration because the unit of onDurationTimer is a PDCCH subframe, which is downlink DL subframes in the case of TDD. OnDurationTimer starts at subframe 7 but since subframe 7 is an uplink UL subframe it extends to subframe 8. Subframe 8 is therefore perceived to be ON. If said 2ms long DRX cycle is not supported, a different HARQ bitmap pattern is needed which will result in the use of fewer LTE subframes.
Figure 3b illustrates an example of an additional DRX pattern with a cycle time that can be used to reduce intra-unit interference in a multi-radio unit. The benefits of including a 5 ms long DRX cycle for LTE and Bluetooth scenarios are shown. The use of the 5ms long DRX cycle allows the use of additional HARQ bitmap patterns. In the absence of the ability to use a 5 ms DRX cycle, fewer LTE subframes can be used.
The exemplary configuration 320 is a TDD configuration 2. The configuration 320 includes m number of frames and has an offset of 5 ms for cycle start. The configuration 320 can further be represented by bitmap 0111101111. The subframes that are disabled here are 0 and 5, resulting in the bitmap 0111101111. According to TDD configuration 2 (which is one of seven available TDD configurations), the subframes are 0,1, 3,4,5,6,8 and 9 subframes for downlink DL and subframes 2 and 7 subframes for uplink UL.
544 571
Since uplink subframes (ie subframes 2 and 7) are usually not considered when looking at LTE and Bluetooth scenarios and subframes 0 and 5 are off, the result is subframes 1, 3, 4, 6, 8 and 9. In other words subframes 1, 3, 4, 6, 8 and 9 are LTE ON downlink subframes received by the 3GPP LTE transceiver. Accordingly, a 5ms long DRX cycle value may be beneficial with configuration 320. Subframes 1, 3 and 4 are included in the first 5 ms cycle and subframes 6, 8 and 9 are included in the second 5 ms cycle. A 10ms long DRX cycle value cannot be used with TDD configuration 2 because subframe 5 is disabled.
In LTE and Bluetooth scenarios, the mentioned 2 ms and 5 ms long DRX cycle values can provide useful reservation patterns for HARQ process for Time Division Duplex (TDD). HARQ can generally be used to ensure that data is transmitted from one node to another node reliably. HARQ. uses a stop-and-wait protocol. A transmitting entity (eg an LTE transceiver) sends the data blocks to a receiving entity (eg an eNB). The sending entity stops and waits until it receives an acknowledgment [acknowledgement] (ACK) or a negative acknowledgment [negative acknowledgment] (NACK) from the receiving entity. The next data block is sent if the sending entity receives an ACK. The same data block is retransmitted if the sending entity receives a NACK. Regardless of whether an ACK or NACK is received, the sending entity schedules and processes the next data block for transmission within a given time period. In LTE, an N-process stop-and-wait can be used, whereby the transmitting device stops and waits for a particular HARQ process. However, there are multiple HARQ processes so from the transmitter perspective it does not stop its transmission.
LTE typically uses multiple HARQ parallel processes that are time-shifted. Since each process transmits a block of data, the sending unit has already received the ACK or NACK from the receiving unit by the time the next transmit assignment arrives, thus creating the next block of data for transmission or retransmission. From the perspective of the sending entity, data can be continuously sent to the receiving entity. In TDD, there is support for a configurable number of HARQ processes.
By applying said 2ms and 5ms long DRX cycle values to LTE and Bluetooth scenarios, 2ms patterns and 5ms patterns are created. These 2ms patterns and 5ms patterns can be considered HARQ compliant patterns. A pattern can be HARQ compliant if (1) each LTE DL subframe that is active is associated with at least one LTE UL subframe for either a DL or UL
544 571
HARQ process; and (2) each LTE UL subframe that is active is associated with at least one LTE DL subframe for either a DL or UL HARQ process and (3) at least one LTE DL HARQ process and one UL HARQ process are activated. In a TDD Configuration 2, there are 192 HARQ compliant patterns and 51 HARQ compliant patterns supported when DRX is applied to LTE and Bluetooth scenarios. The share of HARQ. fulfillment pattern supported when DRX is applied to LTE and Bluetooth scenarios is 27%. In addition, the mentioned 2 ms and 5 ms long DRX cycle values support additional HARQ bitmap patterns. Without using said 2 ms and 5 ms long DR X cycle values, the HARQ bitmap pattern can use a lower number of LTE subframes. In other words, a subframe may include an additional 0 indicating that a particular subframe cannot be used.
By providing a reservation pattern for HARQ process, it is ensured that each radio transceiver of the UE does not transmit/receive information while another radio transceiver of the UE does not receive/transmit information. Such coexistence interference is reduced between said plurality of radio transceivers in the UE. In addition, each radio transceiver may include a different radio access technology (RAT). Examples of RATs include 3GPP LTE, WiMAX, Bluetooth, WLAN, GNSS, etc.
Figure 3c is a timing chart showing an LTE transmit/receive pattern and a Bluetooth transmit/receive pattern according to an example. The LTE Rx pattern and the LTE Tx pattern are identical. Each ON and OFF cycle lasts 2 ms. The bitmap for LTE Rx and LTE Tx is thus 11001100. Each digit (eg exl) indicates whether LTE is ON or (eg ex0) OFF for a period of one second. 11 thereby indicates an ON period of two seconds, and 00 indicates an OFF period of two seconds. As indicated by the timing diagram 300, there is no interference between LTE transmission and Bluetooth reception. In other words, during the time period when LTE is transmitting (ie LTE Tx ON), there is no Bluetooth reception. Correspondingly, during the time period when Bluetooth is receiving (ie BT Rx ON), no LTE transmission occurs. Although there is some overlap between LTE reception and Bluetooth transmission, there is usually no interference due to overlap. The assumption is that Bluetooth transmission does not interfere with LTE reception because the LTE downlink frequency band does not coincide with the Bluetooth transmission frequency band.
The timing diagram 300 relates to an LTE operating in a frequency division duplex (FDD). With FDD, separate frequency bands are used on the transmission side and the reception side.
544 571
Since FDD uses separate frequency bands for transmitting and receiving information, the data signals for transmitting and receiving do not interfere with each other.
The timing chart 300 is a bitmap based TDM solution for coexistence between LTE and Bluetooth. Using an 8ms bitmap (eg 11001100) ensures that LTE does not transmit information at substantially the same time as receiving information with Bluetooth. With an 8 ms long DRX cycle (corresponding to the bitmap as the length 8 ms) can thus be useful for LTE FDD. In some examples, a 4 ms long DRX cycle may be useful for LTE FDD, but unlike the 8 ms long DRX cycle, the 4 ms long DRX cycle does not take advantage of the HARQ. process reservation pattern in LTE FDD. In other words, a number of LTE FDD HARQ._processes can be masked out to enable coexistence between LTE and Bluetooth. For FDD, there are 8 HARQ.processes for the uplink while the downlink can have up to 8 HARQ.processes. The downlink HARQ. processes can be transmitted in any order without a fixed timing while each uplink HARQ. process is assigned to a specific subframe. The UE transmits within the same HARQ. process every eighth subframe. An 8ms long DRX cycle can therefore be useful to reduce coexistence interference between LTE and Bluetooth because the 8ms long DRX cycle corresponds to the 8 uplink and downlink HARQ. processes present in FDD.
Figure 4 illustrates an ASN.1 code example of DRX configuration information in accordance with an example. A first Abstract Syntax Notation [Abstract Syntax Notation 1] (ASN.l) can be used to implement enhancements to existing DRX configurations. DRX-Config-rll (ie DRX Configuration 11) is used to define various characteristics of DRX cycles. Existing DRX-Config-rll includes ASN.1 code to define said onDurationTimer, drxInactivityTimer, drx-RetransmissionTimer, longDRX-CycleStartOffset, shortDRX-Cycle and drxShortCycleTimer. Currently, said longDRX-CycleStartOffset includes cycle values of sflO, sf20, sf32, sf40, etc. The addition of said 2ms, 5ms and 8ms long DRX cycle values can be included in DRX-Config-rll by adding the cycle values of sf2, sf5 and sf8 to ASN.lcode. Since existing DRX-Config-rll does not allow addition, a new DRX-Config-rll can be configured with said 2ms, 5ms and 8ms long DRX cycle values to provide additional DRX patterns that can be used to reduce intra-device interference in a multi-radio unit, as discussed above.
544 571
Figure 5 illustrates a subframe used to receive a downlink reference resource 510 during a long DRX cycle in accordance with an example. The reference resource 510 on the downlink may include a reference signal (RS) sent from the eNB. The measured power of the reference signal at the UE is used to determine the power at which the eNB transmits downlink data. Measured power for the reference signal can be communicated via Channel State Information (CSI) report to the eNB.
In wireless communication, the CSI may refer to known channel characteristics of a communication link. The CSI describes how signals propagate from the transmitter to the receiver. In addition, the CSI can represent the combined effect of spreading, fading, etc. The CSI ensures that transmissions are adapted to current channel conditions and thereby leads to reliable communication by Bluetooth transceivers, LTE transceivers, etc. The CSI is periodically transmitted from the UE to eNB.
In general, the CSI may include at least one of a channel quality indicator (CQ.I), a precoding matrix indicator (PMI), a rank indicator (Rl). The CQJ is information signaled by the UE to the eNB to indicate an appropriate data rate for downlink transmission. The CQJ can be based on a measurement of, on the downlink reception, signal-interference plus noise ratio [Signal to Interference plus Noise Ratio (SINR)] and also by knowledge of various characteristics of the UE receiver. The PMI is a signal fed back by the UE that corresponds to an index of a precoder that maximizes the aggregate number of data bits that can be received over the downlink spatial transmission layers. The Rl is signaled to the eNB through user terminals UE configured for a Physical Downlink Shared Channel (PDSCH). The Rl corresponds to the number of usable transmission layers for spatial multiplexing (based on the UE's estimate of the downlink channel).
The CSI report is typically communicated at least four symbols after the downlink reference resource 510. For the measurement of the reference signal to be correct, the reference signal must be received in a downlink subframe with minimal interference. Interference can reduce the accuracy of reference signal measurements and affect the accuracy of the CSI report. Accordingly, it may be important to select a downlink subframe that has little interference to receive the reference signal.
Currently, the rules for selecting a downlink subframe for a reference resource 510 do not consider the impact of intra-device interference. Accordingly, the measurement of the reference signal in the downlink reference resource symbol 510 may be adversely affected when there is interference
544 571 within the device (eg a Bluetooth transceiver transmitting information at substantially the same time as an LTE transceiver receives a reference signal).
As illustrated in Figure 5, the long DRX cycle of an LTE (or WWAN) transceiver can be divided into a scheduled period and a non-scheduled period. When transitioning from an LTE non-scheduled period to an LTE scheduled period, the UE can be configured to transmit the CSI (eg CQ.I, PMI and Rl) to the eND. The CSI may be based on the reference signal received in the downlink reference resource 510. The downlink reference resource 510 (ie, the time domain reference) may be defined for a downlink subframe n-ncQi_ref.
The CSI reporting subframe 520 occurs at least four subframes after the downlink n-ncQi_ref subframe. In other words, the CSIm is periodically reported at an uplink subframe to the eNB and the uplink subframe occurs at least four subframes after receiving the downlink reference resource 510 subframe. The CSI reporting subframe 520 is placed after a long DRX cycle for a transceiver (eg, a WWAN transceiver) in the UE and corresponds to the downlink reference resource 510 (i.e., the downlink subframe n-ncQi_ref. In some examples, the CSI is reported more than four subframes (eg, six subframes) after the downlink n-ncQi_ref subframe.
When DRX is used as a TDM solution, the CSI measurements need special handling. The downlink reference resource 510 may otherwise be affected by intra-unit interference between co-located transceivers in the multi-radio unit, thereby influencing the UE to report an incorrect CSI. AN incorrect CSI can significantly reduce system capacity. In other words, the average rate of successful message delivery over a communication channel can be reduced as a result of an incorrect CSI. The downlink reference resource 510 should therefore not be affected by intra-device interference.
The downlink n-ncQi_ref subframe cannot be perceived as valid if the downlink n-ncQi_ref subframe is not disturbed by intra-device interference. If the UE receives the reference signal or other type of downlink reference resource in a downlink subframe from the eNB during a time period that does not correspond to another coexisting radio transceiver in the UE transmitting an uplink subframe, the downlink subframe is not affected by interference within the unit. In other words, the downlink n-ncQi_ref subframe is not received at the UE, from the eNB, while there is intra-device interference. As a result, the downlink subframe n-ncQi_ref is valid and can be used to receive a downlink reference resource.
544 571
In some examples, the eNB may assign the downlink subframe n-ncQi_ref for reception by the UE (e.g. an LTE transceiver in the UE) in a subframe at the same time as another transceiver in the UE (e.g. a Bluetooth transceiver) transmits information. If this is known to occur, the downlink n-ncQi_ref subframe may be designated as invalid and not used to receive a reference symbol for the eNB. In other words, the downlink reference resource 510 may be identified not to be used if the downlink subframe associated with the downlink reference resource 510 is disrupted by intra-device interference.
In some examples, the downlink subframe may be designated invalid if the downlink subframe belongs to the non-scheduled period of the long DRX cycle to reduce the risk of intra-device interference in a downlink subframe, as shown in Figure 5. The subframes designated as invalid are not used by the eNB for the transmission of data to the UE. Accordingly, if a DRX solution is used for intra-device coexistence, the downlink reference resource 510 may be received in a downlink subframe that is not included in the scheduled period of the long DRX cycle. In one embodiment, a downlink subframe included in the scheduled period of the long DRX cycle may be designated as a valid subframe for the UE to use for receiving a downlink reference resource, such as an RS. In addition, a subframe in the non-scheduled period may be used by the UE to report the CSI to the eNB based on the reference resource.
In one embodiment, the downlink subframe n-ncQi_ref may be considered valid (i.e. capable of receiving the reference signal) if (1) the downlink subframe is configured as downlink subframe for the UE; (2) the downlink subframe does not include a Multimedia Broadcast Single Frequency Network (MBSFN) subframe (except for transmission mode 9); (3) the downlink subframe does not include a Downlink Pilot Time Slot (DwPTS) field in case the length of the DwPTS is 7680»Ts and less; (4) the downlink subframe does not fall within a configured measurement gap of the UE; (5) the downlink subframe, for periodic CSI reporting, is an element of the CSI subframe set and (6) the downlink subframe is not disturbed by intra-device interference. In addition, the downlink subframe n-ncQi_ref may be considered valid if a downlink subframe is not part of a non-scheduled period when DRX is used to reduce intra-device coexistence.
In some embodiments of the present invention, radio link monitoring (RLM) performed by a WWAN transceiver for a UE may use subframes substantially without intra-unit interference from multiple coexisting radio transceivers in the UE. The RLM function in the UE is to monitor
544 571 the downlink radio link quality of a serving cell in an RRC_CONNECTED state. RLM is based on the cell-specific reference signals. As a result, the UE in the RRC_CONNECTED state can determine whether it is synchronized or unsynchronized with respect to the serving cell. Upon a number of consecutive out-of-synchronization indicators (referred to as N310), the UE may start a network-configured radio link failure timer T310. The timer is stopped if a number N311 of consecutive synchronization indications is reported by the UE's physical layer. Both the out of sync counter and the sync counter (N310 and N311) can be configured by the network. When timer T310 expires, a Radio Link Failure (RLF) occurs, As a result, the UE shuts down its transmitter to avoid interference and then has to re-establish the RRC connection.
When subframes affected by intra-device interference are used for RLM, the interference can cause errors in measurements of cell-specific reference signals. During a non-scheduled period of a long DRX cycle, for example, other RATs (eg WLAN, Bluetooth) may transmit information. A Bluetooth transceiver in the UE can thereby transmit information at essentially the same subframe as where an LTE transceiver receives information, such as cell-specific reference signals. If multiple errors are received, the UE may report a radio link error, close the WWAN transmitter and continue to re-establish an RRC connection. This can result in a reduced capacity and unnecessary network load for the 3GPP network.
A WWAN radio transceiver may, in some examples, be configured to receive RLM in a downlink subframe that occurs during a scheduled period of a long DRX_cycle, thereby reducing the likelihood of performing RLM using subframes affected by intra-device interference. Consequently, the UE may not use subframes affected by intra-device interference while the UE is performing RLM. In addition, during a non-scheduling period of the long DRX cycle, the UE can determine which subframes are not disturbed by intra-device interference. The UE can perform RLM using subframes that are not disturbed by intra-device interference.
In another embodiment, a method 600 for reducing coexistence interference in a multi-radio unit is shown, in accordance with what is shown in the flowchart of Figure 6. The method includes the function of receiving 610 the discontinuous reception (DRX) configuration at the multi-radio unit from an evolved NodeB [evolved NodeB] (eNodeB). The multiradio unit can
544 571 be a user terminal with a plurality of radio transceivers. The method 500 further includes applying 620 the discontinuous reception (DRX) configuration to at least one of the plurality of radio transceivers in the multi-radio unit. The DRX may comprise a long DRX cycle for said at least one of the plurality of radio transceivers. The method further includes selecting one of a 2 millisecond (ms), 5 ms and 8 ms cycle start offset period for the long DRX cycle to reduce coexistence interference between said plurality of radio transceivers in the multi-radio unit.
In one embodiment, said plurality of radio transceivers in method 600 includes a Third Generation Partnership Project Long Term Evolution (3GPP LTE) radio transceiver and a Bluetooth radio transceiver.
In one embodiment, the 2 ms cycle start offset period in method 600 provides at least one HARQ reservation pattern to reduce coexistence interference between Bluetooth radio transceivers and an LTE radio transceiver communicating in LTE Time Division Duplex (LTE-TDD). In addition, the 5 ms cycle start offset period in method 600 provides at least one HARQ. reservation pattern to reduce coexistence interference between Bluetooth radio transceivers and an LTE radio transceiver communicating in LTE Time Division Duplex (LTE-TDD). Further, the 8 ms cycle start offset period in method 600 provides at least one HARQ reservation pattern to reduce coexistence interference between Bluetooth radio transceivers and LTE radio transceivers communicating in LTE Frequency Division Duplex (LTE-FDD). The method 600 may further include monitoring, by the UE, of the Physical Downlink Control Channel (PDCCH) during the long DRX cycle.
In one embodiment, the act of selecting one of a plurality of cycle start offset periods in method 600 includes providing at least one HARQ process reservation pattern to ensure that each radio transceiver of the UE does not transmit/receive information while another radio transceiver is for the UE receives/transmits information, thereby reducing coexistence interference between said plurality of radio transceivers in the UE, each radio transceiver comprising a different radio access technology (RAT).
In another embodiment, a system 700 radio coexistence is shown. Figure 7 illustrates a block diagram of the system 700. The system 700 includes a discontinuous reception (DRX) module 710 configured to apply DRX to a wireless WAN (WWAN) transceiver in a user terminal (UE) with a plurality of coexisting radio transceivers. One
544 571 channel state information (CSI) reporting module 720) is configured to periodically report the CSI, from the UE to the eNB, at a CSI reporting subframe. The CSI reporting subframe may be placed after a long DRX cycle for WWAN transceivers in the UE. A reference resource subframe selection module 730 is configured to select a reference resource downlink subframe relative to a CSI reporting subframe position to enable the reference resource downlink subframe to be received with substantially no intra-device interference from said plurality of co-existing radio transceivers in the EU. A radio link monitoring (RLM) module 740 is configured to perform RLM using subframes for the WWAN receiver with substantially no intra-device interference from said plurality of coexisting radio transceivers in the UE. Said RLM may be performed by the WWAN radio transceiver for the UE during a scheduled period of a long DRX cycle. The system 700 may include a Bluetooth radio 702, a 3GPP LTE radio 704, and a co-located radio 706. While the DRX module, the CSI reporting module, the reference resource subframe selection module and the RLM module are illustrated as being located external to the radio units of the mobile communications unit, it is also possible that the modules are integrated within one or more of the radio units.
In one embodiment, the plurality of coexisting radio transceivers may include at least two radio access technologies (RATs), said RATs including: a 3GPP LTE radio transceiver, a Wireless Local Access Network (WLAN) transceiver, a Bluetooth transceiver, and a Global Navigation Satellite System (GNSS) receiver.
In one embodiment, the reference resource downlink subframe includes a CSI reference resource.
In some embodiments of the present presentation, the CSI reported by the eNB does not significantly reduce UE capacity due to intra-unit interference from said plurality of coexisting radio transceivers in the UE. The CSI further comprises at least one of a channel quality indicator (CQ.I), a precoding matrix indicator (PMI) and a rank indicator (Rl).
In some embodiments, the CSI reporting module 720 is further configured to report the CSI, from the UE to the eNB, during a transition period from a non-scheduled period to a scheduled period, wherein the non-scheduled period and the scheduled period occur during a long DRX cycle of 3GPP LTE radio transceivers. The CSI reporting module 720 is further arranged to periodically report the CSI at an uplink subframe to the eNB, whereby
544 571 the uplink subframe occurs at least four subframes after receiving said reference resource downlink subframe from the eNB. Further, the CSI reporting module 720 is configured to receive the reference frame downlink subframe, at the UE from the eNB, during a time period that does not correspond to another coexisting radio transceiver in the UE transmitting on an uplink subframe. In some examples, the CSI reporting module 720 is further configured to receive the reference resource downlink subframe, at the UE from the eNB, during a scheduled period of a long DRX cycle.
In some embodiments of the present invention, the system 700 may include a radio link monitoring (RLM) module 740 configured to perform RLM using downlink subframes of the 3GPP LTE radio transceiver with substantially no intra-unit interference from said plurality of coexisting radio transceivers in the UE. The RLM module 740 is further configured to perform RLM on the 3GPP LTE radio transceiver of the UE during a scheduled period of one long DRX cycle of the discontinuous receive DRX. The RLM module can determine an intra-device substantially no interference subframe during a non-scheduled period of a long DRX cycle and perform RLM using the intra-device substantially no interference subframe during the non-scheduled period of the long DRX cycle .
In some embodiments, the present invention may include at least one computer-readable medium with stored instructions for reducing coexistence interference in a multi-radio unit, which instructions when executed in a machine affect the machine to: apply discontinuous reception (DRX) to a user terminal (UE) having a plurality of coexistence radio transceiver, said DRX comprising a long DRX cycle for the UE; selecting a cycle start offset period from a plurality of cycle start offset periods for the long DRX cycle to reduce coexistence interference between said plurality of coexisting radio transceivers in the UE and reporting channel state information (CSI), from the UE to the eNB, during the long DRX cycle for the UE and after receiving a reference resource downlink subframe from the eNB, wherein the reference resource downlink subframe is received from the eNB during a period outside the non-scheduled period of a long DRX cycle.
In one computer readable medium embodiment, the location of the reference resource downlink subframe is selected as a subframe substantially without interference within the device from said plurality of
544 571 coexisting radio transceivers in the UE. Further, said plurality of cycle start offset periods for the long DRX cycle include one of 2 milliseconds (ms), 5 ms, and 8 ms.
In one embodiment of the computer-readable medium, the cycle start offset periods are selected to provide at least one reservation pattern for the Hybrid Automatic Repeat Request process to ensure that each radio transceiver of the UE does not transmit/receive information while another radio transceiver of the UE is receiving /transmits information, thereby reducing coexistence interference between said plurality of radio transceivers in the UE, each radio transceiver comprising a different radio access technology.
Figure 8 provides an exemplary illustration of a mobile communication device, such as a user terminal (UE), a mobile station (MS), a wireless device, a tablet computer, a handset or other type of mobile wireless device. The mobile device may include one or more antennas configured to communicate with a base station (BS), an evolved NodeB [evolved Node B] (eNB) or other type of wireless WAN (WWAN) access points. While two antennas are shown, the mobile device may have between one and four or more antennas. The mobile device may be configured to communicate using at least one wireless communication standard including 3GPP LTE, Worldwide Interoperability for Microwave Access (WiMAX), High Speed Packet Access (HSPA), Bluetooth and WiFi. The mobile device may communicate using separate antennas for each wireless communication standard or shared antennas for multiple wireless communication standards. The mobile device can communicate in a wireless local area network (WLAN), a wireless personal area network (WPAN) and/or a wireless WAN (WWAN).
Figure 8 also shows an illustration of a microphone and one or more speakers that can be used to input and output sound from the mobile device. The display may be an LCD display or another type of display such as an organic light emitting diode (OLED) display. The monitor can be configured as a touch screen. The touch screen can use capacitive, resistive or other type of touch screen technology. An application processor and a graphics processor can be coupled to internal memory to provide processing and presentation capabilities. A non-volatile memory port can also provide a user with data input/output options. A keyboard can be integrated into the mobile device or wirelessly connected to the mobile device for
544 571 to provide additional user data. A virtual keyboard can also be provided via the touch screen.
It should be understood that many of the functional units described in this specification have been designated as modules to more specifically emphasize their implementation independence. A module can for example be implemented as a hardware circuit comprising customary VLSI circuits or gate arrays, semiconductor components of standard type such as logic chips, transistors or other discrete components. A module can also be implemented in programmable hardware devices such as a field programmable gate matrix, programmable matrix logic, programmable logic devices or the like.
Modules can also be implemented in software for the execution of different types of processors. An identified module of executable code may, for example, comprise one or more physical or logical blocks of computer instructions, which may for example be organized as an object, procedure or function. The executable parts of an identified module, on the other hand, need not be physically co-located, but may include disparate instructions stored in different locations which, when logically combined, comprise the module and achieve the stated purpose of the module.
A module of executable code can be a single instruction or many instructions, and can also be distributed across several different code segments, among different programs, and across different memory units. Correspondingly, operational data may be identified and illustrated herein within modules and may be embodied in any suitable form and organized within any suitable type of data structure. Operational data can be collected as a single data set or can be distributed across different locations including across different storage devices and can exist, at least in part, as an electronic signal on a system or network. The modules can be passive or active, including agents operating to perform desired functions.
The references given in this description to an embodiment mean that a certain property, structure or characteristic described in connection with this embodiment is included in at least one embodiment of the present invention. The occurrence of phrases in an embodiment in different places in this description do not necessarily refer to the same embodiment.
As they appear herein, multiple items, structural elements, structural elements and/or materials could be presented in a common list for convenience. Such lists shall
544 571, however, is interpreted to identify each member of the list as a separate and unique member. Accordingly, individual members of such a list should not be construed as a de facto equivalent to every other member of the same list based solely on their presentation in a common group without indications to the contrary. Additionally, various embodiments and examples of the present invention may be designated herein along with alternatives for various components thereof. It should be understood that such embodiments, examples and alternatives cannot be construed as de facto equivalents of others, but are to be regarded as separate and autonomous representations of the present invention.
Further, described properties, structures and characteristics may be combined in any suitable manner in one or more embodiments. Various specific details, such as examples of materials, fasteners, size, length, width, dimensions, etc. are provided in the description to provide a thorough understanding of embodiments of the invention. However, those skilled in the art will recognize that the invention may be practiced without one or more of the specific details or with other methods, components, materials, etc. In other cases, well-known structures, materials or measures are not shown or described in detail to avoid obscuring aspects of the invention.
While the foregoing examples are illustrative of the principles of the present invention in one or more applications, it will be apparent to one skilled in the art that various modifications of form, use, and implementation details may be made without the exercise of inventive skill and without departing from the principles and concepts of the present invention. invention. Consequently, the invention is limited solely on the basis of the requirements stated below.
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| FI20135471L | Finland | L | |
| FI20135472A | Finland | A | |
| FI20135472L | Finland | L | |
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| FI20135489L | Finland | L | |
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| FI20135490L | Finland | L | |
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| ITMI20130770A1 | Italy | A1 | |
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Numbers
- Publication
- 544571
- Publication, DOCDB
- 544571
- Publication, EPODOC
- SE544571
- Application
- 1750296
- Application, DOCDB
- 1750296
- Application, EPODOC
- SE20170050296
Titles2
- English
- Device for radio coexistence interference management
- Swedish
- Anordning för radiosamexistensinterferenshantering
Classification
- CPC, 82
- H04W16/14
- H04W72/1215
- H04W76/28
- H04W52/0235
- H04W72/12
- H04B7/2643
- H04W24/10
- H04W72/541
- H04W72/542
- H04W72/54
- H04B7/024
- H04B7/0456
- H04B7/0473
- H04B7/063
- H04B7/0632
- H04B7/0639
- H04B7/0647
- H04B7/065
- H04L1/0026
- H04L1/1803
- H04L1/1822
- H04L5/001
- H04L5/0053
- H04L5/0073
- H04L5/0096
- H04W4/16
- H04W24/02
- H04W36/0088
- H04W36/0094
- H04W48/20
- H04W52/0216
- H04W52/0229
- H04W52/0251
- H04W72/02
- H04W4/90
- H04W76/14
- H04B1/56
- H04B15/00
- H04L5/14
- H04W4/02
- H04W52/0209
- H04W52/0212
- H04W52/0225
- H04W56/00
- H04W56/001
- H04W88/06
- H04L65/00
- H04B7/2612
- H04B15/02
- H04B7/0619
- Y02D30/70
- H04W72/21
- H04W72/23
- H04W72/27
- H04W72/30
- H04W72/51
- H04W72/56
- H04W4/70
- H04W76/18
- H04W76/27
- H04B7/0417
- H04B7/0626
- H04B7/26
- H04J3/00
- H04J3/1694
- H04J3/26
- H04L5/0007
- H04L5/0035
- H04L5/1469
- H04L27/2627
- H04L69/22
- H04L69/324
- H04W4/023
- H04W4/06
- H04W36/00
- H04W36/0061
- H04W36/04
- H04W36/16
- H04W36/22
- H04W72/044
- H04W88/02
- H04W88/08
- IPC, 6
- H04W76 20
- H04B7 06
- H04W4 02
- H04W4 70
- H04W4 90
- H04W72 54